@import url(reset.css);

.container {
    min-height: 100vh;
    display: flex;
    flex-flow: row wrap;
}

.sidebar {
    flex: 0 0 250px;
    background-color: red;
    min-height: 100vh;
}

.threeBoxes {
    flex: 1 0 auto;
    min-height: 100vh;
}

.box1 {
    background-color: green;
    min-height: 33.33vh;
}

.box2 {
    background-color: white;
    min-height: 33.33vh;
}

.box3 {
    background-color: black;
    min-height: 33.33vh;
}