html, body {
    height: 100vh;
}
body {
    display: flex;
	background: #fff;
    color: #000;
	font-family: Nunito, sans-serif;
	font-weight: 200;
	font-size: 18px;
	margin: 0;
	padding: 0 20px;
}
main {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: center;
    flex: 1 1 100%;
}
h1 {
	margin: 0 0 30px 0;
	padding: 0 0 30px 0;
    font-weight: 400;
    font-size: 56px;
    position: relative;
    text-align: center
}
h1:after {
    display: block;
    content: '';
    height: 1px;
    width: 180px;
    background: silver;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
}
p {
    margin: 0;
    padding: 0;
}
ul {
    display: flex;
    margin: 40px 0 0 0;
    padding: 0;
}
ul li {
    display: flex;
    margin: 0 25px 0 0;
    padding: 0;
}
ul li:last-child {
    margin-right: 0;
}
ul li a {
    font-weight: 400;
    text-decoration: none;
    color: gray;
    transition: color .3s;
}
ul li a:hover {
    color: #000;
}
@media (max-width: 640px) {
    h1 {
        font-size: 42px;    
    }
    ul {
        flex-direction: column;
    }
    ul li {
        margin-right: 0;
        margin-bottom: 5px;
        justify-content: center;
    }
    ul li:last-child {
        margin-bottom: 0;
    }
}