style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Delius Swash Caps', cursive;
}

body{
    background-image: url(./papai-noel.gif);
    background-repeat: no-repeat;
    background-position: top;
    background-size: 60%;
    background-color: black;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

#arrow{
    width: 100%;
    height: 12vh;
    text-align: center;
    font-size: 2.5rem;
    cursor: pointer;
    color: aliceblue;
    margin-top: 15rem;
    margin-bottom: 1rem;
}

#arrow p{
    font-size: 1.4rem;
}

#animation{
   transition: 300ms;
   animation-name: piscar;
   animation-duration: 1s;
   animation-timing-function: steps(3, start) ;
   animation-delay: 1s;
   animation-iteration-count: infinite; 
}

@keyframes piscar{
    to{
        visibility: hidden;
    }
}

.rotate{
    transform: rotate(180deg);
    transition: 300ms;
}

.active{
    display: block !important;
}

#about p{
    text-align: center;
    width: 90%;
    margin: 0 auto;
    font-size: 1.2rem;
    color: aliceblue;
}

@media screen and (min-width: 780px) {
    body{
        background-position: top;
        background-size: 20%;
        height: 100vh;
    }
    
    #arrow{
        margin-top: 20rem;
    }

    #about p{
        width: 80%;
    }
}