html { font-size: 100%; line-height: 1.5; height: 100%; background:#1b233a; padding: 2rem; } body { position: relative; margin: 0; min-height: 90vh; height:90vh; background-color: transparent; color: #1e83ec;} #block{  background: url(/medias/lunette_blanche.svg) center top; background-size: cover; background-repeat: no-repeat; border-radius: 10px; padding:4rem; margin: 4rem 0; text-align: center;}#block h1{ color:#0b0c4f; text-align: center; font-weight: 600; } #vCenterBlock { position: relative; top: 50%; }