.vv-biblio { 
  position: relative;
  width: 85%;
  margin-top: 150px;
  margin-right: 5%;
  margin-left: 10%;
 }

 /* Extra small devices (phones, 600px and down) */
@media (width < 600px) {
  .vv-biblio {
    position: relative;
    width: 85%;
    margin-top: 70px;
    margin-right: 5%;
    margin-left: 10%;
  }

  h1 { font-size:1.5em; }
  h2 { font-size:1.5em; line-height:1.5em; }
  p { font-size:1.2em; line-height:1.2em; }
  a { font-size:1em; }
}