* {
    box-sizing: border-box;
}

body {
    display: flex;
    flex-wrap: wrap;
    margin: 0 auto;
    margin: 0px;
}

li {
    text-transform: capitalize;
}

header {
    width: 100%;
    padding: 10px 16px;
    background: orange;
    color: white;
    margin: 0px;
    height: 4.3em;
} 

header h1 {
    display: inline-block;
    font-size: 1.2rem;
}

header li {
    min-width: 4em;
    display: inline-block;
    margin-left: 1em;
    padding: 0.7rem;
    color: #000;
    background-color: #fff;
    border-radius: 5px;
    border: solid 1px #e9e9e9;
    text-decoration: none;
    transition: border 0.3s;
    transition: background-color 0.3s;
}

#sidebar {
    min-height: calc(100vh - 4.3em);
    width: 20vw;
    display: block;
    background: lightgrey;
    padding: 10px;
}

#sidebar li {
    width: fit-content;
    display: block;
    margin-top: 1em;
    padding: 0.7rem;
    color: #000;
    background-color: #fff;
    border-radius: 5px;
    border: solid 1px #e9e9e9;
    text-decoration: none;
    transition: border 0.3s;
    transition: background-color 0.3s;
}

#content {
    background-color: aliceblue;
    min-height: calc(100vh - 4.3em);
    width: 80vw;
    padding: 0.7rem;
}

.content-title {
    text-transform: uppercase;
}

a {
    min-width: 4em;
    display: inline-block;
    margin-left: 1em;
    padding: 0.7rem;
    color: #000;
    background-color: #fff;
    border-radius: 5px;
    border: solid 1px #e9e9e9;
    text-decoration: none;
    transition: border 0.3s;
    transition: background-color 0.3s;
    text-overflow: ellipsis;
}