.sizerex {
      box-shadow: 0 4px 10px 0 rgba(33, 33, 33, 0.15);
      border-radius: 4px;
      position: relative;
      overflow: hidden;
      opacity: .4;
      cursor: not-allowed !important;
      pointer-events: none;
    }
    .sizerex::before {
      content: '';
      display: block;
      position: absolute;
      left: -300px;
      top: 0;
      height: 100%;
      width: 300px;
      background: linear-gradient(to right, transparent 0%, black 50%, transparent 100%);
      animation: load .7s cubic-bezier(0.4, 0.0, 0.2, 1) infinite;
      z-index: 99;
      cursor: wait;
    }
    @keyframes load {
      from {
        left: -300px;
      }
      to   {
        left: 100%;
      }
    }