html,body{
    width: 100%;height: 100%;
    margin: 0;padding: 0;
}

*{
    box-sizing: border-box;
}

#app{
    width: 100%;height: 100%;
    position: relative;
    background-color: aquamarine;
}

#app canvas{
    width: 800px;height: 400px;
    position: absolute;
    left: 50%;top: 50%;
    transform: translate(-50%,-50%);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3)
}


.processbar{
    width: 100%;height: 2px;
    position: absolute;
    top: 0;
    background: #fff;
}

.processline{
    width: 100%;
    height:100%;
    background-color: #90aeff
}