*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
}

body {
    background-color: #212121;
    color: #fff;
    font-family: system-ui, sans-serif;
}

nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: 1rem 0 1rem 2rem ;
    gap: 0.5rem;
    border-bottom: solid 1px #aaa;
    background-color: #eee;
}
nav a {
    display: inline-block;
    min-width: 9rem;
    padding: 0.5rem;
    border-radius: 0.2rem;
    border: solid 1px rgb(22, 22, 22);
    text-align: center;
    text-decoration: none;
    color: #1b1b1b;
}
nav a[aria-current= "page"] {
    color: white;
    background-color: orange;
}

.center {
    display: flex;
    height: 100vh;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

#clock {
    font-size: 40px;
    background-color: orange;
    padding: 20px 50px;
    margin-top: 10px;
    border-radius: 10px;
}