style.css

/* CSS DOCUMENT */
*{
    background-color: #f5f4f4;
    font-size: 1rem;
    font-family: sans-serif;
}

/* MAIN */
main{
    text-align: center;
    margin: auto;
}

/* CONTENT */
.content h1,.content h2,.content h3 {
    font-size: 35px;
}

/* ICONS */
.icons p{
    margin-top: 2rem;
}

.icons img{
    width: 60px;
    max-width: 80px;
}

/* START */
.start a {
    display: block;
    max-width: 400px;
    margin: 15px auto;
    padding: 5px 30px;
    font-family: monospace;
    font-size: 22px;
    text-decoration: none;
    color: black;
    border: 5px solid orange;
    background-color: #feac32;
} 

.start a:hover{
    background-color: #ffb443;
}

.start figure{
    margin: 15px;
}

.start img{
    width: 100%;
    max-width: 625px;
}

.start figcaption{
    font-weight: bold;
    font-size: 18px;
    margin: 15px;
}

@media all and (min-width: 600px) {
    /* ICONS */
    .icons img{
        width: 70px;
        margin: 0 10px;
    }

    /* START */
    .start a{
        font-size: 25px;
    }
}