*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
    text-decoration: none;
    color: black;
}

html{
    font-size: 62.5%;
}

header{
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 50px;
    padding: 0 20px;
    box-shadow: 1px 1px 1px 1px lightgrey;
}

header a{
    position: relative;
    font-size: 2rem;
}

header a:hover{
    color: red;
}

header #main_tabs a{
    margin-left: 1em;
}

header a span{
    position: absolute;
    width: 20px;
    height: 20px;
    top: -30%;
    right: -30%;
    background-color: black;
    color: white;
    border-radius: 50%;
    font-size: 1.5rem;
    padding: .2em;
    text-align: center;
}