header {
    height: 50px;
    width: 100%;
    background-color: crimson;

    position: fixed;
    top: 0;

    z-index: 101;

    font-family: Love, cursive;
    font-size: 1em;

    display: flex;
    align-items: center;
}

header h1 {
    margin-left: 10px;
}