.snowEffect {
    position: fixed;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    z-index: 99;
    overflow: hidden;
    pointer-events:none; /*Không có dòng này là ko click đc các phần tử khác*/
}
#snowcanvas{
    position: fixed;
    z-index: 0;
}
    .page-loading {
      position: fixed;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 100%;
      -webkit-transition: all .4s .2s ease-in-out;
      transition: all .4s .2s ease-in-out;
      background-color: #fff;
      opacity: 0;
      visibility: hidden;
      z-index: 9999;
    }
    .dark-mode .page-loading {
      background-color: #0b0f19;
    }
    .page-loading.active {
      opacity: 1;
      visibility: visible;
    }
    .page-loading-inner {
      position: absolute;
      top: 50%;
      left: 0;
      width: 100%;
      text-align: center;
      -webkit-transform: translateY(-50%);
      transform: translateY(-50%);
      -webkit-transition: opacity .2s ease-in-out;
      transition: opacity .2s ease-in-out;
      opacity: 0;
    }
    .page-loading.active > .page-loading-inner {
      opacity: 1;
    }
    .page-loading-inner > span {
      display: block;
      font-size: 1rem;
      font-weight: normal;
      color: #9397ad;
    }
    .dark-mode .page-loading-inner > span {
      color: #fff;
      opacity: .6;
    }
    .page-spinner {
      display: inline-block;
      width: 2.75rem;
      height: 2.75rem;
      margin-bottom: .75rem;
      vertical-align: text-bottom;
      border: .15em solid #b4b7c9;
      border-right-color: transparent;
      border-radius: 50%;
      -webkit-animation: spinner .75s linear infinite;
      animation: spinner .75s linear infinite;
    }
    .dark-mode .page-spinner {
      border-color: rgba(255,255,255,.4);
      border-right-color: transparent;
    }
    @-webkit-keyframes spinner {
      100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
      }
    }
    @keyframes spinner {
      100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
      }
    }