/* 相册组件 */

   .bigimg {
     width: auto !important;
     height: auto !important;
     max-width: 70vw !important;
     max-height: 70vh !important;
     position: fixed;
     left: 0;
     top: 0;
     right: 0;
     bottom: 0;
     margin: auto;
     display: none;
     z-index: 9999;
     border: 0px solid #fff;
     object-fit: contain;
   }

   .mask {
     position: fixed;
     left: 0;
     top: 0;
     right: 0;
     bottom: 0;
     background-color: #000000cc;
     z-index: 9998;
     transition: all 1s;
     display: none
   }

   .mask img {
     width: 50px;
     height: 50px;
     background: #fff;
     padding: 15px;
     border-radius: 50%;
     position: fixed;
     bottom: 5vh;
     left: calc(50% - 25px);
   }

   @media (max-width: 640px) {
     .mask img {
       bottom: 10vh;
     }
   }