.maintitle{
    text-align: center;
    color: black;
    font-size: 48px;
    text-shadow: 2px 2px 2px red;
}

.welcome_oneliner{
    text-align: center;
    font-size: 45px;
}

img{
   padding: 5px;
    max-width: 100%;
    height: auto;
    display: block;
    margin: auto;
}