styles.css

body, * {
    box-sizing: border-box;
}

body {
    margin: 0;
    overflow: hidden;
    max-height: 100vh;
}

#test1 {
    min-height: 100vh;
    background-color: #777;
    background-image: url('./gifs/apartment.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;

    position: relative;
}

/*#test1 .ground {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 20%;

    background-color: #524cc6;
}*/

#test1 .entity {
    position: absolute;

    height: 400px;
    width: 400px;
    /*border-radius: 100%;
    background: #39c695;*/
    /*background-image: url('./gifs/walk.gif');*/
    background-size: contain;
    background-repeat: no-repeat;
}

#test1 .entity[data-idle=true] {
    background-image: url('./gifs/idle.png');
}
#test1 .entity[data-idle=false] {
    background-image: url('./gifs/walk.gif');
}
#test1 .entity[data-state=left] {

}
#test1 .entity[data-state=right] {
    transform: rotateY(180deg);
}