一生回ってろ

spin.css

a#user-dropdown-toggle.js-tooltip.settings.dropdown-toggle.js-dropdown-toggle,
img.DashboardProfileCard-avatarImage.js-action-profile-avatar,
img.top-timeline-tweet-box-user-image.avatar.size32,
img.ProfileAvatar-image,
img.avatar.js-action-profile-avatar {
  font-size: 100px;
  
    -webkit-animation: spin 0.5s linear infinite;
    -moz-animation: spin 0.5s linear infinite;
    -ms-animation: spin 0.5s linear infinite;
    -o-animation: spin 0.5s linear infinite;
    animation: spin 0.5s linear infinite;
}

@-webkit-keyframes spin {
	0% {-webkit-transform: rotate(0deg);}
	100% {-webkit-transform: rotate(360deg);}
}
@-moz-keyframes spin {
	0% {-moz-transform: rotate(0deg);}
	100% {-moz-transform: rotate(360deg);}
}
@-o-keyframes spin {
	0% {-o-transform: rotate(0deg);}
	100% {-o-transform: rotate(360deg);}
}
@keyframes spin {
	0% {transform: rotate(0deg);}
	100% {transform: rotate(360deg);}
}