Custom CSS to enchance Trello.

trello_styles.css

/* Show the move cursor to demonstrate drag/drop scrolling on the interface. */
#board {
    cursor: move;
}

#board .list {
    cursor: default;
}

/* Change the background to a texture while maintaining board color. */
.body-board-view {
    background-image: url(http://www.transparenttextures.com/patterns/black-linen.png);
    background-size: initial;
}

/* Prevent cards with images from taking up too much vertical real estate. */
.list {
    -moz-transition: all 0.25s ease 0s;
    -o-transition: all 0.25s ease 0s;
    -webkit-transition: all 0.25s ease 0s;
    background: rgba(255,255,255,.4);
    color: #fff;
    transition: all 0.25s ease 0s;
    width: 250px;
}

.list a.open-card-composer {
    background: none;
    color: #ffffff;
}

.list-card-cover {
    -moz-transition: all 0.25s ease 0s;
    -o-transition: all 0.25s ease 0s;
    -webkit-transition: all 0.25s ease 0s;
    /* height: 30px; */ /* Trello updated to have this class on all cards- not just ones with pictures. */
    max-height: 150px;
    transition: all 0.25s ease 0s;
}

.list-card.has-stickers .list-card-details {
    margin-top: 0;
}

/* Expand to show the cover image of the card when hovering. */
/*
.list-card:hover .list-card-cover {
    height: 150px ;
}
*/

.list-header {
    border-radius: 3px 3px 0 0;
}

.list-header-num-cards {
    color: rgba(255,255,255,0.6);
    font-size: 12px;
}

/* Colorize the headers of each column. Add more as needed. */
.list:nth-of-type(1) .list-header {
    background: rgb(100,200,210);
}

.list:nth-of-type(1):hover {
    background: rgb(100,200,210);
}

.list:nth-of-type(2) .list-header {
    background: rgb(160,110,60);
}

.list:nth-of-type(2):hover {
    background: rgb(160,110,60);
}

.list:nth-of-type(3) .list-header {
    background: rgb(140,70,160);
}

.list:nth-of-type(3):hover {
    background: rgb(140,70,160);
}

.list:nth-of-type(4) .list-header {
    background: rgb(170,70,70);
}

.list:nth-of-type(4):hover {
    background: rgb(170,70,70);
}

.list:nth-of-type(5) .list-header {
    background: rgb(200,200,90);
}

.list:nth-of-type(5):hover {
    background: rgb(200,200,90);
}

.list:nth-of-type(6) .list-header {
    background: rgb(100,160,110);
}

.list:nth-of-type(6):hover {
    background: rgb(100,160,110);
}

/* This hides the sidebar button. */
.sidebar-hide-btn {
    display: none;
}

/* This hides all stickers. */
.sticker, .stickers, .window-cover-stickers-only {
    display: none;
}

.window-cover, .list-card-cover {
    background-size: cover ;
    background-position: top center;
}

/* These can be used to further demonstrate drag/drop. However, JS injection would nbe needed.
#board {
    cursor: -webkit-grabbing;
}

#board {
    cursor: -webkit-grab;
}
*/