.mask2{
    width: 100%;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
    background-color: rgba(255, 255, 255, 1);
}
.mask_hidden {
    overflow: hidden;
}
#index{
    background-position: 50%;
    background-repeat: no-repeat;
    background-size: cover;
}
canvas{
    display: block;
    position: fixed;
    touch-action: none;
    object-fit: cover;
    width: 100vw;
    height: 100%;
    cursor: inherit;
    opacity: 1;
    z-index: 9999;
    top: 0;
    transition: all 1.5s linear;
}
.stop{
  display: none;
}
.mask-svg {
    width: 100px;
    height: 100px;
    position: fixed;
    top: calc( 50% - 58px );
    left: calc( 50% - 43px );
    -webkit-transform: rotate(-90deg);
    transform: rotate(-90deg);
    z-index: 9999;
}
.mask-svg-45{
    width: 100px;
    height: 100px;
    position: fixed;
    top: calc( 50% - 38px );
    left: calc( 50% - 49px );
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
    z-index: 9999;
}
#mask-svg-rect-top {
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
}
#mask-svg-rect-left {
    stroke-dasharray: 600;
    stroke-dashoffset: 870;
}
.mask_bgbox{
    background-color: #fff;
    height: 100vh;
    position: fixed;
    z-index: 999;
}