body {
    background: url(bg.png); 
    background-attachment: fixed;
    background-origin: border-box;
    background-size: cover;
}

.cont { 
    padding-top: 70px; 
    float: center;
    justify-content:center; 
    width: 100%; 
    padding-bottom: 30px; 
} 

.box { 
    text-align: left;
    background-color: rgba(200, 200, 200, 75%); 
    margin-left: 10%; 
    padding-left: 20px; 
    width: 80%; 
    font-size: 15px;
    font-family: Arial, Helvetica, sans-serif; 
    margin-bottom: 10px; 
    margin-bottom: 30px; 
    padding-top: 10px; 
    padding-bottom: 10px; 
} 

.box ol { 
    padding-left: 20px; 
} 

.box h1 {
    font-size: 25px;
} 

.box h2 {
    font-size: 20px;
} 

@media (max-width: 767px) {
    .box {
        font-size: 10px;
    }

    .box h1 {
        font-size: 20px; 
    } 

    .box h2 {
        font-size: 15px; 
    } 
}