style.css

body {
    margin: 0;
    padding: 0;
    font-family: "Helvetica", "sans-serif";
    text-align: center;
}

a {
    text-decoration: none;
    color: black;
}

header {
    background: #f3976c;
}

header,
h1 {
    text-align: center;
    padding: 30px 0;
}

.div-choice {
    display: flex;
    justify-content: space-around;
    padding: 30px 0;
}

.btn-main {
    padding: 20px;
    border-radius: 40px;
    font-size: 16px;
    box-shadow: 1px 1px 10px #202020;
    text-transform: uppercase;
}

.btn-old {
    border: 2px solid #f3976c;
    background-color: #f3976c;
    color: #fff;
}

.btn-old:hover {
    background-color: white;
    color: #f3976c;
    box-shadow: 2px 2px 20px #404040;
}

.btn-new {
    border: 2px solid #f3976c;
    color: #f3976c;
}

.btn-new:hover {
    background-color: #f3976c;
    color: white;
    box-shadow: 2px 2px 20px #404040;
}