.arena {
    width: calc(100vh - 160px - 6rem);
    height: calc(100vh - 160px - 6rem);
    overflow: hidden;
    display: grid;
    margin: 0 auto;
    border: 1px dashed black;
    position: relative;
}

.pane {
    display: block;
    overflow: hidden;
    position: relative;
    border: 1px solid white;
}

.pane.has-apple {
    padding: 16%;
}

.apple {
    background: #e45c52;    
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 20px;
}

.pane.body {
    background: #00d2b5;
}

.pane.head {
    background: #009e6c;
}