html {
   font-size: 10px;
}

.separator {
    width: 100%;
    height: 100px;
    background-color: blue;
}

h1 {
   font-size: 30px;
}

p {
   font-size: 20px;
}

@media screen and (min-width: 800px) {
    .separator {
        height: 150px;
    }
    h1 {
        font-size: 45px;
        text-align: center;
    }
    p {
        font-size: 30px;
        text-align: center;
   }
}
