html {
    box-sizing: border-box;
    scroll-behavior: smooth;
}
*,
*:before,
*:after {
    box-sizing: inherit;
}
body {
    color: #333;
    font-size: 16px;
    font-family: "Trebuchet MS", Helvetica, sans-serif;
    margin: 0;
    padding-left: 250px;
}
.nav {
    position: fixed;
    left: 0;
    top: 0;
    width: 250px;
    height: 100vh;
    background: #f5f5f5;
    padding: 20px;
    border-right: 1px solid #ddd;
}
.nav a {
    display: block;
    color: #333;
    text-decoration: none;
    padding: 10px;
    margin: 5px 0;
    border-radius: 4px;
    transition: background 0.3s;
}
.nav a:hover {
    background: #e0e0e0;
}
.wrapper {
    width: 1200px;
    max-width: calc(100% - 30px);
    margin: 0 auto;
    text-align: center;
}
img {
    max-width: 100%;
    height: auto;
    vertical-align: top;
}
h2 {
    margin: 0;
    scroll-margin-top: 20px;
}
p {
    margin: 15px auto;
}
.section {
    min-height: 100vh;
    padding: 20px;
}
.nav a[href="#variation-one"] {
    background: linear-gradient(
        to right,
        #b44d02 0%,
        #b44d02 33.333333%,
        #add8e6 33.333333%,
        #add8e6 66.666666%,
        #008080 66.666666%,
        #008080 100%
    );
    color: white;
}
.nav a[href="#variation-two"] {
    background: linear-gradient(
        to right,
        #be9330 0%,
        #be9330 33.333333%,
        #717657 33.333333%,
        #717657 66.666666%,
        #b45a0e 66.666666%,
        #b45a0e 100%
    );
    color: white;
}