*  {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: .2s linear;
}

a {
    text-decoration: none;
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 10;
}

.logo {
    font-size: 1.5rem;
}

.menu {
    list-style-type: none;
}

.menu li {
    display: inline;
    margin-right: 20px;
}

.menu li a {
    color: #fff;
    text-decoration: none;
}

nav {
    align-items: center;
    display: flex;
    justify-content: space-between;
}