.game-container {
    position: relative;
    width: 100%;
    max-width: 375px;
    /* iPhone size for testing */
    margin: 0 auto;
}

.flash-message {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 14px;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    pointer-events: none;
    /* ignore clicks */
    z-index: 2000;
}

#arena {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid #000;
}

.sprite-hitbox {
    position: absolute;
    width: 64px;
    height: 64px;
    cursor: pointer;
    background: rgba(0, 0, 0, 0);
    /* invisible */
}

.sprite-menu {
    display: none;
    position: absolute;
    background: #fff;
    border: 1px solid #333;
    padding: 5px;
    z-index: 1000;
}

.menu-item {
    padding: 5px;
    cursor: pointer;
}

.menu-item:hover {
    background: #eee;
}