ant-design/components/drawer/style/drawer.less

@dawer-prefix-cls: ~"@{ant-prefix}-drawer";
@ease-in-out-circ: cubic-bezier(0.78, 0.14, 0.15, 0.86);

.@{dawer-prefix-cls} {
  position: fixed;
  top: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;

  >* {
    transition: all .3s @ease-in-out-circ;
  }

  &-content-wrapper {
    position: absolute;
    z-index: @zindex-modal-mask + 1;
  }

  &-left,
  &-right {
    .@{dawer-prefix-cls}-content-wrapper,
    .@{dawer-prefix-cls}-content {
      height: 100%;
    }
  }
  &-left {
    &.@{dawer-prefix-cls}-open {
      .@{dawer-prefix-cls} {
        &-wrapper {
          box-shadow: 2px 0 8px rgba(0, 0, 0, 0.15);
        }
      }
    }
  }
  &-right {
    .@{dawer-prefix-cls} {
      &-content-wrapper {
        right: 0;
      }
    }
    &.@{dawer-prefix-cls}-open {
      & .@{dawer-prefix-cls} {
        &-wrapper {
          box-shadow: -2px 0 8px rgba(0, 0, 0, 0.15);
        }
      }
    }
  }
  &.@{dawer-prefix-cls}-open {
    > * {
      pointer-events: auto;
    }
    .@{dawer-prefix-cls} {
      &-mask {
        opacity: 0.3;
        display: block;
      }
    }
  }

  &-title {
    margin: 0;
    font-size: @font-size-lg;
    line-height: 22px;
    font-weight: 500;
    color: @heading-color;
  }

  &-content {
    position: relative;
    background-color: @component-background;
    border: 0;
    background-clip: padding-box;
    box-shadow: @shadow-2;
  }

  &-close {
    cursor: pointer;
    border: 0;
    background: transparent;
    position: absolute;
    right: 0;
    top: 0;
    z-index: 10;
    font-weight: 700;
    line-height: 1;
    text-decoration: none;
    transition: color 0.3s;
    color: @text-color-secondary;
    outline: 0;
    padding: 0;

    &-x {
      display: block;
      font-style: normal;
      text-align: center;
      text-transform: none;
      text-rendering: auto;
      width: 56px;
      height: 56px;
      line-height: 56px;
      font-size: @font-size-lg;

      &:before {
        content: "\e633";
        display: block;
        font-family: "anticon" !important;
      }
    }

    &:focus,
    &:hover {
      color: #444;
      text-decoration: none;
    }
  }

  &-header {
    padding: 16px 24px;
    border-radius: @border-radius-base @border-radius-base 0 0;
    background: @component-background;
    color: @text-color;
    border-bottom: @border-width-base @border-style-base @border-color-split;
  }

  &-body {
    padding: 24px;
    font-size: @font-size-base;
    line-height: @line-height-base;
    word-wrap: break-word;
  }

  &.zoom-enter,
  &.zoom-appear {
    animation-duration: @animation-duration-slow;
    transform: none; // reset scale avoid mousePosition bug
    opacity: 0;
  }

  &-mask {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    display: none;
    background-color: #373737;
    background-color: @modal-mask-bg; // lesshint duplicateProperty: false
    height: 100%;
    z-index: @zindex-modal-mask;
    filter: ~"alpha(opacity=50)";
  }

  &-open {
    overflow: hidden;
  }
}

@media (max-width: @screen-md) {
  .@{dawer-prefix-cls} {
    width: auto !important;
    margin: 10px;
  }
}