#return-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgb(0, 0, 0);
    background: rgba(0, 0, 0, 0.7);
    width: 50px;
    height: 50px;
    display: block;
    text-decoration: none;
    -webkit-border-radius: 35px;
    -moz-border-radius: 35px;
    border-radius: 35px;
    display: none;
    -webkit-transition: all 0.3s linear;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}
#return-to-top i {
    color: #fff;
    margin: 0;
    position: relative;
    left: 16px;
    top: 13px;
    font-size: 19px;
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}
#return-to-top:hover {
    background: rgba(0, 0, 0, 0.9);
}
#return-to-top:hover i {
    color: #fff;
    top: 5px;
}


#wrapper-img-300 {
    width: 300px; height: 300px;
    border-radius: 300px;
    overflow: hidden;
    position: absolute; /* this breaks the overflow:hidden in Chrome/Opera */
}

#box-img-300 {
    width: 300px; height: 300px;
    background-color: #cde;
}

#wrapper-img-200 {
    width: 200px; height: 200px;
    border-radius: 200px;
    overflow: hidden;
    position: absolute; /* this breaks the overflow:hidden in Chrome/Opera */
}

#box-img-200 {
    width: 200px; height: 200px;
    background-color: #cde;
}

#wrapper-img-100 {
    width: 100px; height: 100px;
    border-radius: 100px;
    overflow: hidden;
    position: absolute; /* this breaks the overflow:hidden in Chrome/Opera */
}

#box-img-100 {
    width: 100px; height: 100px;
    background-color: #cde;
}