/* [BACKGROUND] */
#numpad-back {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    visibility: hidden;
    opacity: 0;
    transition: 0.3s;
  }
  #numpad-back.show {
    visibility: visible;
    opacity: 1;
  }
  
  /* [NUMPAD] */
  #numpad-wrap, #numpad-display {
    /* FONT - REMOVE THIS TO FOLLOW YOUR CURRENT THEME */
    font-family: 'Arial', sans-serif;
  }
  #numpad-wrap {
    max-width: 320px;
    margin: 0 auto;
    padding: 10px;
    background: #f2f2f2;
    border: 1px solid #ccc;
  }
  
  /* [NUMBER DISPLAY] */
  #numpad-display {
    box-sizing: border-box;
    width: 100%;
    padding: 5px;
    font-size: 2em;
    text-align: center;
    margin-bottom: 10px;
  }
  
  /* [NUMBER BUTTONS] */
  #numpad-btns {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
  }
  .numpad-btn {
    box-sizing: border-box;
    width: 25%;
    padding: 10px;
    border: 1px solid #aaa;
    background: #444;
    color: #fff;
    text-align: center;
    font-size: 1.5em;
  }
  .numpad-btn.zero {
    width: 50%;
  }
  .numpad-btn.zeroN {
    width: 75%;
  }
  .numpad-btn.ninja {
    display: none;
  }
  .numpad-btn.ng {
    background: #333;
  }
  .numpad-btn.cx {
    background: #B23025;
    border: 1px solid #C73D32;
  }
  .numpad-btn.ok {
    background: #1FA83A;
    border: 1px solid #1FC72D;
  }
  .numpad-btn:hover {
    cursor: pointer;
  }