html {
    box-sizing: border-box;
    font-size: 10px;
    background: blue;
}

*, *:before, *:after {
    box-sizing: inherit;
}

body {
    padding: 0;
    margin: 0;
    font-family: 'Amatic SC', cursive;
}

h1 {
    text-align: center;
    font-size: 10rem;
    line-height: 1;
    margin-bottom: 0;
}

.comenzar {
    margin-left: auto;
    margin-right: auto;
}

.score {
    background: rgba(255,255,255,0.2);
    padding: 0 3rem;
    line-height: 1;
    border-radius: 1rem;
}

.game {
    width: 600px;
    height: 400px;
    display: flex;
    flex-wrap: wrap;
    margin: 0 auto;
}

.hole {
    flex: 1 0 33.33%;
    overflow: hidden;
    position: relative;
}

.hole:after {
    display: block;
    background: url(https://lh3.googleusercontent.com/proxy/M0g1x_XG7w29yxquWBxbSCXBlwsiwrY5Pg2C1td7LLTXhM0l3VjJqH1KOIcfOg5lYtA8Tj0YjNdAMxR4fzma7XHFkzBwJUqiB7mtXv95VBML4SNvW2-jD3xtWVkNPwcEGgoySkAu140sYn66Ytue-yRDGh_4A_6gGfs) bottom center no-repeat;
    background-size: contain;
    content: '';
    width: 100%;
    height:70px;
    position: absolute;
    z-index: 1;
    bottom: -20px;
}

.mole {
    background: url(https://4.bp.blogspot.com/_-e6TbQx4hh4/SgRJvs4DMTI/AAAAAAAAAA0/duejXNSrLhc/w1200-h630-p-k-no-nu/uribevelenazi.jpg) bottom center no-repeat;
    background-size: 60%;
    position: absolute;
    top: 100%;
    width: 100%;
    height: 100%;
    transition:all 0.4s;
}

.hole.up .mole {
    top: 0;
}