body, html {
	margin: 0;
	padding: 0;
	overscroll-behavior: none;
	overflow: hidden;   
}
canvas{
    /* background-size: cover;
    background-repeat: no-repeat;
    background-position: center,center;
    background-image: url(../static/miku_bg2.png); */
	vertical-align: bottom;
	user-select: none;
	-webkit-touch-callout:none;
	-webkit-user-select:none;
}
canvas:focus {outline: none;}
canvas::selection{background-color:transparent}
/* style */
#gpu-text{
    position: absolute;
    top: 15px;left:20px;
    z-index: 100;color: #222;
    font-size: .5em;
}
#btn-area{
    position: absolute;
    display: flex;
    top: 50px;left:20px;
}
#Play-Btn{
    z-index: 100;
    font-size: min(4vw, 2em);
}
#Stop-Btn{
    z-index: 100;
    font-size: min(4vw, 2em);
}
.select_box{
    position: absolute;
    top: 100px;
    left:20px;
    z-index: 10;
    font-size: min(2vw, 1em);
}
.select_box_text{
    color: #222;
    font-size: min(2vw, 1em);
    margin: 0;
}
.is-active{
    opacity: 0.6;
}

#nav-bar-wrap{display:block;position:absolute;left:0;top:0;background-color:gray;width:100%;height:5px;z-index:10}
#nav-bar{display:block;position:relative;left:0;bottom:0;background-color:#6be6ed;width:0;height:5px;z-index: 8;}