personal_site/_sass/header.scss

// The header with info about me
// gets displayed on the left in a wide layout and on the top in a narrow layout
header {
    border-right: 2px solid #eee; //make a nice dividing line
    position: fixed;
    width: 240px;
    height: 100vw;
    padding-right: 30px;
    padding-left: 30px;
    
    flex: 0 0 240px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    text-align: right;
    top: 0px;
}

header .profile-pic-name {
    text-align: center;
}

header .avatar {
    max-width: 175px;
    border-radius: 50%;
    padding: 5px;
    border: 1px solid #f2f3f3;
}

header h1 {
    font-size: 2em;
}

header h1, header h2 {
    font-family: Impact, Haettenschweiler, "Franklin Gothic Bold", Charcoal, "Helvetica Inserat", "Bitstream Vera Sans Bold", "Arial Black", "sans serif", HelveticaNeue-CondensedBlack;
}

header img.icon {
    height: 1em;
    width: 1em;
    margin-right: 0.5em;
    flex: 0 0 auto;
}

header p.professional-links {
    display: flex;
    flex-direction: column;
}

header p.professional-links a {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

@media only screen and (max-width: 700px) {
    header {
      position: relative;
      width: 100%;
      border: 0px;
      text-align: center;
      height: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
  
    header .avatar {
        margin: auto;
    } 

    nav {
        display: flex;
        flex-direction: row;
        justify-content: center;
    }
    nav a {
        margin-left: 1em;
    }
}