* {
    box-sizing: border-box;
}

body {
    width: 100%;
    height: 100%;
    border: 0px;
    overflow: hidden;
    
}

.floor {
    position: absolute;
    top: 0%;
    left: 0%;
    width: 100%;
    height: 100%;
    background: url("mall-entrance1.jpg");
    background-size: 100% 100%;


}

canvas {
    position: absolute;
    top: 0%;
    left: 0%;
    width: 100%;
    height: 100%;
}

#back {
    position: fixed;
    font-size: 40px;
    font-weight: bolder;
    top: 55%;
    left: 50%;
    color: #0F0;
    text-shadow: 0 0 10px #000;
    
}
#start {
    position: fixed;
    font-size: 40px;
    font-weight: bolder;
    top: 40%;
    left: 50%;
    color: #FF0;
    animation: shimmer;
    animation-duration: 5s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
}

@keyframes shimmer {
    0% {color: #FF0;}
    20% {color: #FF5; text-shadow: 0px 0px 5px #FF0, 0px 0px 10px #FFF;}
    40% {color: #FF0; text-shadow: 0px 0px 0px #000;}
    100% {color: #FF0;}
}