html, body {
    height: 100%;
    margin: 10px;
}

body.dark {
    background-color: #3a3a3c;
}

.main-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    align-items: center;
    flex-grow: 1;
    height: 100%;
}

.header {
    flex: 1;
}

body.dark .header {
    color: #d7dadc;
}

.board {
    flex: 6;
    overflow-y: auto;
}

.board-row {
    display: flex;
    flex-direction: row;
    width: 100%;
}

.board-row.current {
    background-color: #eee;
    border: 3px solid #ccc;
    border-radius: 10px;
}

body.dark .board-row.current {
    background-color: #888;
    border: 3px solid #555;
}

.tile {
    background-color: #ddd;
    border-radius: 10px;
    width: 62px;
    height: 62px;
    margin: 5px;
    line-height: 62px;
    font-family: monospace;
    font-size: 3em;
    font-weight: bold;
}

.tile.present {
    background-color: #c9b458;
    color: #fff;
}

.tile.correct {
    background-color: #6aaa64;
    color: #fff;
}

body.dark .tile {
    background-color: #777;
}

body.dark .tile.present {
    background-color: #c9b458;
}

body.dark .tile.correct {
    background-color: #6aaa64;
}

.keyboard {
    flex: 3;
}

.btn.key {
    background-color: #ddd;
    margin: 3px;
    height: 2.5em;
    padding: 7px;
    font-family: monospace;
}

.btn.key.wrong {
    background-color: #777;
}

.btn.key.right {
    background-color: #6aaa64;
}

body.dark .btn.key {
    background-color: #777;
}

body.dark .btn.key.wrong {
    background-color: #444;
}

body.dark .btn.key.right {
    background-color: #6aaa64;
}

.popup {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.9);
    border: 3px solid #ddd;
    border-radius: 10px;
    padding: 20px 40px;
}

body.dark .popup {
    background-color: rgba(70, 70, 70, 0.9);
    color: #d7dadc;
}

.shake {
    animation: shake 0.82s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
  10%, 90% {
    transform: translate3d(-1px, 0, 0);
  }

  20%, 80% {
    transform: translate3d(2px, 0, 0);
  }

  30%, 50%, 70% {
    transform: translate3d(-4px, 0, 0);
  }

  40%, 60% {
    transform: translate3d(4px, 0, 0);
  }
}