body {
    margin: 0;
    padding: 0;
}

.photostrip img {
    width: 30%;
    display: block;
    margin: auto;

}

.phototext {
    margin-top: 100px;
    text-align: center;
}

.btn {
    background-color: gray;
    display: block;
    margin: 10px auto;
}

.btn:hover {
    background-color: lightgrey;
}

.sentence {
    text-align: center;
}

footer{
    text-align: center;
    margin: 30px;
}