*{box-sizing:border-box}

.box{background:rgba(255, 255, 255, 0.938);margin:10% auto;max-width:500px;padding:10px;text-align:center}
h4{font-size:1.2em;font-weight:400}
p{color:rgb(0, 0, 0);margin-bottom:0}
body{
    background-image: url('background.jpg');
    background-position: center;
    background-size: cover;
    font-family:Helvetica Neue,Helvetica,Arial,sans-serif;
    font-size:15px;
    line-height:1.4;
    padding:20px}