ant-design/style/components/message.less

@prefixMessageClass: ant-message;

.@{prefixMessageClass} {
  font-size: 12px;
  position: fixed;
  z-index: 1000;
  width: 100%;
  top: 16px;

  &-notice {
    width: auto;
    vertical-align: middle;
    position: absolute;
    left: 50%;
  }

  &-notice-content {
    position: relative;
    right: 50%;
    padding: 8px 16px;
    border-radius: @border-radius-base;
    border: 1px solid #e9e9e9;
    box-shadow: 0 0 4px rgba(0,0,0,0.16);
    background: #fff;
    display: block;
  }

  &-custom-content {
  }

  &-success {
    color: @success-color;
  }

  &-error {
    color: @error-color;
  }

  &-info {
    color: @primary-color;
  }

  .anticon {
    margin-right: 8px;
    font-size: 14px;
  }
}