body {
    text-align: center;
    background-color: chartreuse;
    margin-top: 0px;
    margin-bottom: 0px;
}

div {
    background-color: white;
    width: 700px;
    margin-left: auto;
    margin-right:auto;
}

h2 {
    margin-top: 0px;
}

h2:hover{
    color:darkorchid;
    cursor: pointer;
}

img {
    width: 500px;
}

img:hover {
    width: 300px;
}