Overleaf/services/web/public/stylesheets/app/base.less

.system-message {
    padding: (@line-height-computed / 4) (@line-height-computed / 2);
    background-color: @state-warning-bg;
    color: #333;
    border-bottom: 1px solid @toolbar-border-color;
}

.clickable {
    cursor: pointer;
}

.img-circle {
	display: inline-block;
	overflow: hidden;
	border-radius: 50%;
	width: @line-height-computed * 4;
	height: @line-height-computed * 4;
	img {
		margin-top: -10px;
	}
}

@-webkit-keyframes bounce {
  0%, 10%, 26%, 40%, 50% {
    -webkit-transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    -webkit-transform: translate3d(0,0,0);
    transform: translate3d(0,0,0);
  }

  20%, 21% {
    -webkit-transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
    transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
    -webkit-transform: translate3d(0, -10px, 0);
    transform: translate3d(0, -10px, 0);
  }

  35% {
    -webkit-transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
    transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
    -webkit-transform: translate3d(0, -5px, 0);
    transform: translate3d(0, -5px, 0);
  }

  45% {
    -webkit-transform: translate3d(0,-2px,0);
    transform: translate3d(0,-2px,0);
  }
  
  50% {
    -webkit-transform: translate3d(0,0,0);
    transform: translate3d(0,0,0);
  }
}

@keyframes bounce {
  0%, 10%, 26%, 40%, 50% {
    -webkit-transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    -webkit-transform: translate3d(0,0,0);
    -ms-transform: translate3d(0,0,0);
    transform: translate3d(0,0,0);
  }

  20%, 21% {
    -webkit-transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
    transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
    -webkit-transform: translate3d(0, -10px, 0);
    -ms-transform: translate3d(0, -10px, 0);
    transform: translate3d(0, -10px, 0);
  }

  35% {
    -webkit-transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
    transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
    -webkit-transform: translate3d(0, -5px, 0);
    -ms-transform: translate3d(0, -5px, 0);
    transform: translate3d(0, -5px, 0);
  }

  45% {
    -webkit-transform: translate3d(0,-2px,0);
    -ms-transform: translate3d(0,-2px,0);
    transform: translate3d(0,-2px,0);
  }

  50% {
    -webkit-transform: translate3d(0,0,0);
    -ms-transform: translate3d(0,0,0);
    transform: translate3d(0,0,0);
  }
}

.bounce {
  -webkit-animation-duration: 2s;
  animation-duration: 2s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation-iteration-count: infinite;
  animation-iteration-count: infinite;
  -webkit-animation-name: bounce;
  animation-name: bounce;
  -webkit-transform-origin: center bottom;
  -ms-transform-origin: center bottom;
  transform-origin: center bottom;
}