css shapes from https://css-tricks.com/examples/ShapesOfCSS/

shapes.css

#square {
    width: 100px;
    height: 100px;
    background: red;
}

#rectangle {
    width: 200px;
    height: 100px;
    background: red;
}

#circle {
    width: 100px;
    height: 100px;
    background: red;
    -moz-border-radius: 50px;
    -webkit-border-radius: 50px;
    border-radius: 50px;
}
/* Cleaner, but slightly less support: use "50%" as value */

#oval {
    width: 200px;
    height: 100px;
    background: red;
    -moz-border-radius: 100px / 50px;
    -webkit-border-radius: 100px / 50px;
    border-radius: 100px / 50px;
}
/* Cleaner, but slightly less support: use "50%" as value */

#triangle-up {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 100px solid red;
}

#triangle-down {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 100px solid red;
}

#triangle-left {
    width: 0;
    height: 0;
    border-top: 50px solid transparent;
    border-right: 100px solid red;
    border-bottom: 50px solid transparent;
}

#triangle-right {
    width: 0;
    height: 0;
    border-top: 50px solid transparent;
    border-left: 100px solid red;
    border-bottom: 50px solid transparent;
}

#triangle-topleft {
    width: 0;
    height: 0;
    border-top: 100px solid red;
    border-right: 100px solid transparent;
}

#triangle-topright {
    width: 0;
    height: 0;
    border-top: 100px solid red;
    border-left: 100px solid transparent;
}

#triangle-bottomleft {
    width: 0;
    height: 0;
    border-bottom: 100px solid red;
    border-right: 100px solid transparent;
}

#triangle-bottomright {
    width: 0;
    height: 0;
    border-bottom: 100px solid red;
    border-left: 100px solid transparent;
}

#curvedarrow {
    position: relative;
    width: 0;
    height: 0;
    border-top: 9px solid transparent;
    border-right: 9px solid red;
    -webkit-transform: rotate(10deg);
    -moz-transform: rotate(10deg);
    -ms-transform: rotate(10deg);
    -o-transform: rotate(10deg);
}

#curvedarrow:after {
    content: "";
    position: absolute;
    border: 0 solid transparent;
    border-top: 3px solid red;
    border-radius: 20px 0 0 0;
    top: -12px;
    left: -9px;
    width: 12px;
    height: 12px;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
}

#trapezoid {
    border-bottom: 100px solid red;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    height: 0;
    width: 100px;
}

#parallelogram {
    width: 150px;
    height: 100px;
    -webkit-transform: skew(20deg);
    -moz-transform: skew(20deg);
    -o-transform: skew(20deg);
    background: red;
}

#star-six {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 100px solid red;
    position: relative;
}

#star-six:after {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 100px solid red;
    position: absolute;
    content: "";
    top: 30px;
    left: -50px;
}

#star-five {
    margin: 50px 0;
    position: relative;
    display: block;
    color: red;
    width: 0px;
    height: 0px;
    border-right: 100px solid transparent;
    border-bottom: 70px solid red;
    border-left: 100px solid transparent;
    -moz-transform: rotate(35deg);
    -webkit-transform: rotate(35deg);
    -ms-transform: rotate(35deg);
    -o-transform: rotate(35deg);
}

#star-five:before {
    border-bottom: 80px solid red;
    border-left: 30px solid transparent;
    border-right: 30px solid transparent;
    position: absolute;
    height: 0;
    width: 0;
    top: -45px;
    left: -65px;
    display: block;
    content: '';
    -webkit-transform: rotate(-35deg);
    -moz-transform: rotate(-35deg);
    -ms-transform: rotate(-35deg);
    -o-transform: rotate(-35deg);
}

#star-five:after {
    position: absolute;
    display: block;
    color: red;
    top: 3px;
    left: -105px;
    width: 0px;
    height: 0px;
    border-right: 100px solid transparent;
    border-bottom: 70px solid red;
    border-left: 100px solid transparent;
    -webkit-transform: rotate(-70deg);
    -moz-transform: rotate(-70deg);
    -ms-transform: rotate(-70deg);
    -o-transform: rotate(-70deg);
    content: '';
}

#pentagon {
    position: relative;
    width: 54px;
    border-width: 50px 18px 0;
    border-style: solid;
    border-color: red transparent;
}

#pentagon:before {
    content: "";
    position: absolute;
    height: 0;
    width: 0;
    top: -85px;
    left: -18px;
    border-width: 0 45px 35px;
    border-style: solid;
    border-color: transparent transparent red;
}

#hexagon {
    width: 100px;
    height: 55px;
    background: red;
    position: relative;
}

#hexagon:before {
    content: "";
    position: absolute;
    top: -25px;
    left: 0;
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 25px solid red;
}

#hexagon:after {
    content: "";
    position: absolute;
    bottom: -25px;
    left: 0;
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 25px solid red;
}

#octagon {
    width: 100px;
    height: 100px;
    background: red;
    position: relative;
}

#octagon:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    border-bottom: 29px solid red;
    border-left: 29px solid #eee;
    border-right: 29px solid #eee;
    width: 42px;
    height: 0;
}

#octagon:after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    border-top: 29px solid red;
    border-left: 29px solid #eee;
    border-right: 29px solid #eee;
    width: 42px;
    height: 0;
}

#heart {
    position: relative;
    width: 100px;
    height: 90px;
}

#heart:before,
#heart:after {
    position: absolute;
    content: "";
    left: 50px;
    top: 0;
    width: 50px;
    height: 80px;
    background: red;
    -moz-border-radius: 50px 50px 0 0;
    border-radius: 50px 50px 0 0;
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
    -webkit-transform-origin: 0 100%;
    -moz-transform-origin: 0 100%;
    -ms-transform-origin: 0 100%;
    -o-transform-origin: 0 100%;
    transform-origin: 0 100%;
}

#heart:after {
    left: 0;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
    -webkit-transform-origin: 100% 100%;
    -moz-transform-origin: 100% 100%;
    -ms-transform-origin: 100% 100%;
    -o-transform-origin: 100% 100%;
    transform-origin: 100% 100%;
}

#infinity {
    position: relative;
    width: 212px;
    height: 100px;
}

#infinity:before,
#infinity:after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 60px;
    height: 60px;
    border: 20px solid red;
    -moz-border-radius: 50px 50px 0 50px;
    border-radius: 50px 50px 0 50px;
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
}

#infinity:after {
    left: auto;
    right: 0;
    -moz-border-radius: 50px 50px 50px 0;
    border-radius: 50px 50px 50px 0;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
}

#diamond {
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-bottom-color: red;
    position: relative;
    top: -50px;
}

#diamond:after {
    content: '';
    position: absolute;
    left: -50px;
    top: 50px;
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-top-color: red;
}

#diamond-shield {
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-bottom: 20px solid red;
    position: relative;
    top: -50px;
}

#diamond-shield:after {
    content: '';
    position: absolute;
    left: -50px;
    top: 20px;
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-top: 70px solid red;
}

#diamond-narrow {
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-bottom: 70px solid red;
    position: relative;
    top: -50px;
}

#diamond-narrow:after {
    content: '';
    position: absolute;
    left: -50px;
    top: 70px;
    width: 0;
    height: 0;
    border: 50px solid transparent;
    border-top: 70px solid red;
}

#cut-diamond {
    border-style: solid;
    border-color: transparent transparent red transparent;
    border-width: 0 25px 25px 25px;
    height: 0;
    width: 50px;
    position: relative;
    margin: 20px 0 50px 0;
}

#cut-diamond:after {
    content: "";
    position: absolute;
    top: 25px;
    left: -25px;
    width: 0;
    height: 0;
    border-style: solid;
    border-color: red transparent transparent transparent;
    border-width: 70px 50px 0 50px;
}

#egg {
    display: block;
    width: 126px;
    height: 180px;
    background-color: red;
    -webkit-border-radius: 63px 63px 63px 63px / 108px 108px 72px 72px;
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
}

#pacman {
    width: 0px;
    height: 0px;
    border-right: 60px solid transparent;
    border-top: 60px solid red;
    border-left: 60px solid red;
    border-bottom: 60px solid red;
    border-top-left-radius: 60px;
    border-top-right-radius: 60px;
    border-bottom-left-radius: 60px;
    border-bottom-right-radius: 60px;
}

#talkbubble {
    width: 120px;
    height: 80px;
    background: red;
    position: relative;
    -moz-border-radius: 10px;
    -webkit-border-radius: 10px;
    border-radius: 10px;
}

#talkbubble:before {
    content: "";
    position: absolute;
    right: 100%;
    top: 26px;
    width: 0;
    height: 0;
    border-top: 13px solid transparent;
    border-right: 26px solid red;
    border-bottom: 13px solid transparent;
}

#burst-12 {
    background: red;
    width: 80px;
    height: 80px;
    position: relative;
    text-align: center;
}

#burst-12:before,
#burst-12:after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 80px;
    width: 80px;
    background: red;
}

#burst-12:before {
    -webkit-transform: rotate(30deg);
    -moz-transform: rotate(30deg);
    -ms-transform: rotate(30deg);
    -o-transform: rotate(30deg);
}

#burst-12:after {
    -webkit-transform: rotate(60deg);
    -moz-transform: rotate(60deg);
    -ms-transform: rotate(60deg);
    -o-transform: rotate(60deg);
}

#burst-8 {
    background: red;
    width: 80px;
    height: 80px;
    position: relative;
    text-align: center;
    -webkit-transform: rotate(20deg);
    -moz-transform: rotate(20deg);
    -ms-transform: rotate(20deg);
    -o-transform: rotate(20eg);
}

#burst-8:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 80px;
    width: 80px;
    background: red;
    -webkit-transform: rotate(135deg);
    -moz-transform: rotate(135deg);
    -ms-transform: rotate(135deg);
    -o-transform: rotate(135deg);
}

#yin-yang {
    width: 96px;
    height: 48px;
    background: #eee;
    border-color: red;
    border-style: solid;
    border-width: 2px 2px 50px 2px;
    border-radius: 100%;
    position: relative;
}

#yin-yang:before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0;
    background: #eee;
    border: 18px solid red;
    border-radius: 100%;
    width: 12px;
    height: 12px;
}

#yin-yang:after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    background: red;
    border: 18px solid #eee;
    border-radius: 100%;
    width: 12px;
    height: 12px;
}

#badge-ribbon {
    position: relative;
    background: red;
    height: 100px;
    width: 100px;
    -moz-border-radius: 50px;
    -webkit-border-radius: 50px;
    border-radius: 50px;
}

#badge-ribbon:before,
#badge-ribbon:after {
    content: '';
    position: absolute;
    border-bottom: 70px solid red;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    top: 70px;
    left: -10px;
    -webkit-transform: rotate(-140deg);
    -moz-transform: rotate(-140deg);
    -ms-transform: rotate(-140deg);
    -o-transform: rotate(-140deg);
}

#badge-ribbon:after {
    left: auto;
    right: -10px;
    -webkit-transform: rotate(140deg);
    -moz-transform: rotate(140deg);
    -ms-transform: rotate(140deg);
    -o-transform: rotate(140deg);
}

#space-invader {
    box-shadow: 0 0 0 1em red, 0 1em 0 1em red, -2.5em 1.5em 0 .5em red, 2.5em 1.5em 0 .5em red, -3em -3em 0 0 red, 3em -3em 0 0 red, -2em -2em 0 0 red, 2em -2em 0 0 red, -3em -1em 0 0 red, -2em -1em 0 0 red, 2em -1em 0 0 red, 3em -1em 0 0 red, -4em 0 0 0 red, -3em 0 0 0 red, 3em 0 0 0 red, 4em 0 0 0 red, -5em 1em 0 0 red, -4em 1em 0 0 red, 4em 1em 0 0 red, 5em 1em 0 0 red, -5em 2em 0 0 red, 5em 2em 0 0 red, -5em 3em 0 0 red, -3em 3em 0 0 red, 3em 3em 0 0 red, 5em 3em 0 0 red, -2em 4em 0 0 red, -1em 4em 0 0 red, 1em 4em 0 0 red, 2em 4em 0 0 red;
    background: red;
    width: 1em;
    height: 1em;
    overflow: hidden;
    margin: 50px 0 70px 65px;
}

#tv {
    position: relative;
    width: 200px;
    height: 150px;
    margin: 20px 0;
    background: red;
    border-radius: 50% / 10%;
    color: white;
    text-align: center;
    text-indent: .1em;
}

#tv:before {
    content: '';
    position: absolute;
    top: 10%;
    bottom: 10%;
    right: -5%;
    left: -5%;
    background: inherit;
    border-radius: 5% / 50%;
}

#chevron {
    position: relative;
    text-align: center;
    padding: 12px;
    margin-bottom: 6px;
    height: 60px;
    width: 200px;
}

#chevron:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 51%;
    background: red;
    -webkit-transform: skew(0deg, 6deg);
    -moz-transform: skew(0deg, 6deg);
    -ms-transform: skew(0deg, 6deg);
    -o-transform: skew(0deg, 6deg);
    transform: skew(0deg, 6deg);
}

#chevron:after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    height: 100%;
    width: 50%;
    background: red;
    -webkit-transform: skew(0deg, -6deg);
    -moz-transform: skew(0deg, -6deg);
    -ms-transform: skew(0deg, -6deg);
    -o-transform: skew(0deg, -6deg);
    transform: skew(0deg, -6deg);
}

​ #magnifying-glass {
    font-size: 10em;
    /* This controls the size. */

    display: inline-block;
    width: 0.4em;
    height: 0.4em;
    border: 0.1em solid red;
    position: relative;
    border-radius: 0.35em;
}

#magnifying-glass::before {
    content: "";
    display: inline-block;
    position: absolute;
    right: -0.25em;
    bottom: -0.1em;
    border-width: 0;
    background: red;
    width: 0.35em;
    height: 0.08em;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
}

#facebook-icon {
    background: red;
    text-indent: -999em;
    width: 100px;
    height: 110px;
    border-radius: 5px;
    position: relative;
    overflow: hidden;
    border: 15px solid red;
    border-bottom: 0;
}

#facebook-icon::before {
    content: "/20";
    position: absolute;
    background: red;
    width: 40px;
    height: 90px;
    bottom: -30px;
    right: -37px;
    border: 20px solid #eee;
    border-radius: 25px;
}

#facebook-icon::after {
    content: "/20";
    position: absolute;
    width: 55px;
    top: 50px;
    height: 20px;
    background: #eee;
    right: 5px;
}

#moon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    box-shadow: 15px 15px 0 0 red;
}

#flag {
    width: 110px;
    height: 56px;
    padding-top: 15px;
    position: relative;
    background: red;
    color: white;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-align: center;
    text-transform: uppercase;
}

#flag:after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 0;
    border-bottom: 13px solid #eee;
    border-left: 55px solid transparent;
    border-right: 55px solid transparent;
}

#cone {
    width: 0;
    height: 0;
    border-left: 70px solid transparent;
    border-right: 70px solid transparent;
    border-top: 100px solid red;
    -moz-border-radius: 50%;
    -webkit-border-radius: 50%;
    border-radius: 50%;
}

#cross {
    background: red;
    height: 100px;
    position: relative;
    width: 20px;
}

#cross:after {
    background: red;
    content: "";
    height: 20px;
    left: -40px;
    position: absolute;
    top: 40px;
    width: 100px;
}

#base {
    background: red;
    display: inline-block;
    height: 55px;
    margin-left: 20px;
    margin-top: 55px;
    position: relative;
    width: 100px;
}

#base:before {
    border-bottom: 35px solid red;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    content: "";
    height: 0;
    left: 0;
    position: absolute;
    top: -35px;
    width: 0;
}