form{ width:450px; margin:auto; bckground: rgba(0,0,0,0.4); padding: 10px 20px; box-sizing: border-box; margin-top: 20px; border-radius: 7px; } h2{ color: white; text-align:center; margin: 0; font-size: 30px; margin-botton: 20px; } input, textarea{ width:100%; margin-botton: 30px; padding: 7px; box-sizing: border-box; font-size: 17px; border: none; } textarea{ min-height: 100px; max-height: 200px; max-width: 100%; } #boton{ background: #31384A; color: #fff; padding: 20px; } #boton:hover { cursor: pointer; } @media (max-width:480px) { form{ width: 100%; } } h1{ text-align: center; color: #fff; font-size: 40px; background: rgba(0,0,0,0.4); margin-top: 20px; }