overleaf/services/web/public/stylesheets/components/card.less

.card {
  background-color: white;
  border-radius: @border-radius-base;
  -webkit-box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
  padding: @line-height-computed;
  .page-header {
  	margin: 0 0 1.5625rem;
  	h1, h2, h3 {
  		margin-top: 0;
  	}
  }
  > .container-fluid {
    padding: 0;
  }

  .card-header {
      border-bottom: 1px solid @gray-lighter;
      padding-bottom: @line-height-computed;
      margin-bottom: @line-height-computed;
      h2 {
          margin: 0;
      }
  }
}

.card-thin {
  padding: @line-height-computed / 2
}

.card-group {
    .card {
        margin: @line-height-computed -15px 0 -15px;
        border-radius: 0;

        &.card-highlighted {
            // Bring card in front of other cards
            position: relative;
            z-index: 1;
            // Make it taller and card like
            margin-top: 0;
            border-radius: @border-radius-base;
        }

        &.card-first {
            border-top-left-radius: @border-radius-base;
            border-bottom-left-radius: @border-radius-base;
        }
        &.card-last {
            border-top-right-radius: @border-radius-base;
            border-bottom-right-radius: @border-radius-base;
        }
    }
}