common.css

html {
    scroll-behavior: smooth;
}
* {
    margin: 0;
    padding: 0;
    font-family: Tahoma;
    box-sizing: border-box;
}
header {
    background: #112233;
    padding: 16px;
}
.logo {
    width: 240px;
    margin: auto;
}
.logo img {
    width: 100%;
    height: auto;
}
nav {
    text-align: center;
    margin-top: 16px;
}
nav a {
    color: #fff;
    text-decoration: none;
    margin: 10px;
    padding: 2px 8px 4px 8px;
    font-size: 18px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    border-radius: 6px;
}
nav a:hover, .active {
    background: #fff;
    color: #444;
}
footer {
    background: #172528;
    padding: 20px;
    color: #fff;
}
.copyright {
    text-align: center;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}
.copyright a {
    color: #fff;
}
.mail {
    text-align: center;
    margin-bottom: 16px;
}
.mail a {
    text-decoration: none;
    color: #fff;
    font-family: 'Trebuchet MS', sans-serif;
    font-size: 18px;
    line-height: 1.6;
}
.mail a:hover {
    border-bottom: solid 2px;
}
.comments {
    padding: 16px;
    width: 75%;
    margin: auto;
}
@media (max-width: 920px) {
    .comments {
        width: 96%;
    }
    .mail a {
        font-size: 16px;
    }
}