body {
    margin: 10px;
    padding: 0px;
    font-family: Sans-Serif;
    box-sizing: border-box;
    display: flex;
    min-height: 80vh;
    background: #156690;
    color: #696969;
}

form {
    margin: auto;
    width: 50%;
    max-width: 400px;
    background: #F3F3F3;
    padding: 10px;
    border: 1px solid rgba(0,0,0,0.2);
}
  
h2 {
    text-align: center;
    margin-bottom: 0px;
    color: rgba(0,0,0,0.5);
}

.texto {
   display: block;
   padding: 10px;
   margin: 30px 0;
   font-size: 20px;
   border-radius: 10px;
   width:90%;
}

.boton {
    display: block;
    padding: 10px;
    margin: 30px 0;
    font-size: 20px;
    border-radius: 10px;
    color: White;
    background: #02E173;
    opacity: 0.5;
    width: 90%;
    margin-left: 10px;
}

@media (max-width:768px) {
    form     {
    width:75%;
    }
}

@media (max-width:480px) {
    form     {
    width:95%;
    }
}