#loading {
    width: 100%;
    height: 100%;
    background-color: black;
    position: fixed;
    z-index: -1;
    opacity: 0;
    transition: all 0.3s;
}

#loading * {
    text-align: center;
}
#loading .box{
    /*border: 1px solid;*/
    position: absolute;
    width:400px;
    height:200px;
    left:50%;
    top:50%;
    margin-left:-200px;
    margin-top:-200px;
    display: none;
    color: white;
}
#loading-powered-by{
    width: 100%;
    font-size: 12px;
    color: grey;
    text-align: center;
    position: absolute;
    bottom: 1em;
}
#loading .title {
    font-size: 30px;
}

#on-load-file-name{
    font-size: 16px;
    color: grey;
    line-height: 35px;
}
#text-percent{
    font-size: 30px;
    top: 83px;
    position: absolute;
    width: 100%;
}
.circle-box{
    margin: 30px auto;
    width: 200px;
    height: 200px;
    position: relative
}
.mask{
    overflow: hidden;
    width: 50%;
    height: 100%;
    top: 0;
    position: absolute;
}
.mask.right{
    right: 0;
}
.mask.left{
    left: 0;
}
.circle {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 1.5px solid #4e4e4e;
    background-color: transparent;
    overflow: hidden;
    position: absolute;
    box-sizing: border-box;
    top: 0;
    left: 0;
    transition: all 0.5s ;
}
.circle.right{
    clip:rect(0,auto,auto,100px);
    border: 2px solid white;
    transform: rotate(-180deg);
    left: -100px;
}
.circle.left{
    clip:rect(0,100px,auto,auto);
    border: 2px solid white;
    transform: rotate(-180deg);
}