.container{
    max-width:750px;
    margin-left:auto;
    margin-right:auto;
    text-align: center;
    font-size: larger;
}
.container>p{
    text-align:left;
}
#mainImage img{
    max-width:25%;
    height:auto;
}
#mainImage figcaption{
    font-size:small;
}