*, *::before, *::after {
    box-sizing: border-box;
    user-select: none;
}

 body {
    margin:0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
 }

 .world {
    overflow: hidden;
    position: relative;
 }

 .score {
    position:absolute;
    font-size: 30px;
    right: 1vmin;
    top: 1vmin;
 }

.start-screen {
    position: absolute;
    font-size: 5vmin;
    top: 50%;
    left: 50%;
    transform:translate(-50%, -50%) ;
}

.hide {
    display: none;
}

.ground{
    --left: 0 ;
    position: absolute;
    width: 300%;
    bottom: 0;
    left: calc(var(--left)* 1%)
}

.dino {
    --bottom:0; 
    position: absolute;
    left: 1%;
    height: 30%;
    bottom: calc(var(--bottom) *1%);
}

.cactus {
   
    position: absolute;
    left:calc(var(--left)*1%);
    height: 30%;
    bottom: 0;
}