*{
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    font-size: 14px;
    margin: 0;
    padding: 0;
}


.about{
    width: 100%;
    height: 100%;
    display: flex;
    background: url("img/fon.jpg");
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
}
.about .center{
    margin: auto;
    color: #fff;
    font-size: 2em;
    width: 26em;
    max-width: 80%;
    text-align: center;
    background: #00000085;
    padding: .5em;
    border: 2px solid #fff;
    font-weight: 500;
}
.about .center .span{
    font-size: 1.3em;
}


@media (max-width: 800px){
    *{
        font-size: 10px;
    }

    .about .center{
        width: auto;
    }

}