.stackable {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.stackable-header {
    /*border:2px solid green;*/
    display: fixed;
    top: 0;
    width: 100%;
}

.stackable-content {
    flex: 1 1 auto;
    overflow: auto;
}

.stackable-footer {
    /*border: 2px solid red;*/
    /* position: absolute;*/
    width: 100%;
    /*bottom: 0;*/
}