position div to bottom of containing div

.outside {
    width: 200px;
    height: 200px;
    background-color: #EEE; /*to make it visible*/
}

Needs to be

.outside {
    position: relative;
    width: 200px;
    height: 200px;
    background-color: #EEE; /*to make it visible*/
}

Absolute positioning looks for the nearest relatively positioned parent within the DOM, if one isn’t defined it will use the body.