*                           { 
    margin:0;
    padding:0;
    box-sizing:border-box;
    user-select:none;
}

body                        { 
    height:100vh;
    overflow:hidden; 
}

main                        { 
    position:fixed;
    left:0;
    top:0;
    width:100vw;
    height:100vh;
    background-repeat:repeat-x;
    background-color:#f7dfaf;
    background-position:center bottom;
}

#container {
    background-image: url('../sprites/bg.png');
    background-repeat: repeat-x;
    background-position:center bottom;
    left:0;
    top:0;
    width:100vw;
    height:100vh;
    overflow: hidden;
    position: relative;
}

#ground {
    background-image: url('../sprites/ground.png');
    background-repeat: repeat-x;
    background-position: 0 0;
    width: 100%;
    height: 64px;
    position: absolute;
    bottom: 0;
}

#mario {
    --mario_position:100px;
    --scale-of-mario:2.5;
    width:55px;
    height:85px;
    background-image:url("../sprites/sprite.png");
    background-position:-110px -170px;
    position:absolute;
    bottom:125px;
    left:var(--mario_position);
    transform:scale(var(--scale-of-mario));
}

@keyframes walking {
    100% { background-position-x:-165px; }
}

@keyframes jump {
    0% { bottom:170px; }
    45%,55% { bottom:500px }
    100% { bottom:170px; }
}

#mario.walking{
    animation:walking 0.3s steps(3) infinite;
    background-position:0px -85px;
}

#mario.right { 
    transform:scaleX(-1) scale(2.5);
}

/* when standing still mario's sprite changes to dacing.gif */
#mario.standing {
    background-image:url("../sprites/dancing.gif");
    background-size:contain;
    background-repeat:no-repeat;
    background-position:center;
    animation:none;
    transform:scale(3.8);
}

#mario.jump{
    animation:jump 0.5s 1 linear;
    background-position:-55px -170px;
}

#mario.running {
    animation:walking 0.3s steps(3) infinite;
    background-position: 0px 0px;
}

#luigi {
    width: 55px;
    height: 85px;
    background-image: url("../sprites/luigidance.gif");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    position: absolute;
    bottom: 125px;
    transform: scale(3.8);
    display: none;
    right: var(--luigi_position, 100px);
}