.bottone-utility {
    position: absolute;
    bottom: 0px;
    right: 0px;
    background-color: #555;
    color: white;
    font-size: 10px;
    padding: 9px 18px;
    border: none;
    cursor: pointer;
    border-radius: 5px;
    text-align: center;
}

.container-img {
    margin-top: 3px;
    margin-left: 3px;
    margin-bottom: 3px;
    margin-right: 3px;
    position: relative;
    float: left;
}