Tumblr Controls (invert)

iframe#tumblr_controls {
    right: 3px !important;
    position: fixed !important;
    opacity: 0.2;
    white-space: nowrap;
    -webkit-filter: invert(100%);
    -moz-filter: invert(100%);
    -o-filter: invert(100%);
    -ms-filter: invert(100%);
    filter: invert(100%);
    -webkit-transition: opacity 0.7s linear;
    -webkit-transition: all 0.5s ease-in-out;
    -moz-transition: all 0.5s ease-in-out;
    -o-transition: all 0.5s ease-in-out;
    transition: all 0.5s ease-in-out;
}

iframe#tumblr_controls:hover {
    opacity: 0.7;
}