.logo{
    display: block;
    max-width: 250px;
    max-height: 250px;
    width: auto;
    height: auto;
    margin-left: auto;
    margin-right: auto;
}

.subimage{
    display: block;
    max-width: 300px;
    max-height: 300px;
    width: auto;
    height: auto;
    border-radius: 10%;
}

@media screen and (max-width: 768px){
    .logo{
        border-radius: 50%;
    }

    .subimage{
        display: none;
    }
}