body{
    background-color: #011126;
    font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #fff;
}

.principal{
    width: 100%;
    height: 98vh;
    display: grid;
    align-items: center;

}

.principal > img{
    width: 30%;
    margin: auto;
}

@media only screen and (max-width: 768px) {
    .principal > img{
        width: 80%;
    }
}