style.css

body {
    padding: 0px;
    margin: 0;
    background-color: #0b1e2a;
}

.sectRev {
    margin-top: 50px;
    display: grid;
    grid-template-columns: 5% 90% 5%;
    grid-template-rows: 20% 80%;
}

h1 {
    color: #ecf0f1;
    font-family: sans-serif;
    font-size: 35px;
    font-weight: bolt;
    text-align: center;
    grid-column: 2;
    grid-row: 1;
    margin-bottom: 45px;
}

.contRev {
    background-color: #102F43;
    grid-column: 2;
    grid-row: 2;
    text-align: center;
    height: 500px;
    border-radius: 15px;
    margin-left: 10%;
    margin-right: 10%;
}

#imgRev {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    border: solid 2px #3498db;
    margin-top: 30px;
}

#titleRev {
    font-family: monospace;
    font-size: 30px;
    font-weight: 600;
    color: #ecf0f1;
    margin-bottom: 5px;
}

#spanRev {
    font-family: monospace;
    font-size: 15px;
    font-weight: 400;
    color: #3498db;
}

#textRev {
    margin-right: 5%;
    margin-left: 5%;
    font-family: sans-serif;
    font-weight: 400;
    color: #979a9a;
    line-height: 27px;
}

#btnRev {
    padding: 10px;
    margin-top: 20px;
    border: solid 2px #3498db;
    background-color: #0b1e2a;
    border-radius: 3px;
    color: #3498db;
    font-family: monospace;
    font-size: 15px;
    font-weight: 400;
}

#btnRev:hover {
    background-color: #102F43;
}

@media screen and (min-width: 575px ) and (max-width: 990px) and (orientation:portrait) {
    .sectRev {
        margin-top: 10px;
    }

    .contRev {
        height: 500px;
        padding-left: 3%;
        padding-right: 3%;
    }
}

@media screen and (max-width: 575px) and (orientation:portrait) {
    .sectRev {
        margin-top: 0px;
    }

    .contRev {
        margin-left: 0px;
        margin-right: 0px;
        height: 580px;
    }
}