body {
    margin: 0px;
  }
  
  .hidden {
    visibility: hidden;
  }
  
  .toolbar {
    display: flex;
    background: #4289b5; 
    justify-content: center;
  }
  
  .toolbar > div {
    padding: 10px 20px;
    text-align: center;
  }
  
  .toolbar > div.button {
    padding: 20px 10px;
  }
  
  .ml-auto {
    margin-left: auto;
  }
  
  .mr-auto {
    margin-right: auto;
  }
  
  h1 {
    line-height: 50px;
    font-size: 50px;
    margin: 0px;
    color: #ffffff;
  }
  
  .subheading {
    color: #ffffff; 
    font-size: 1rem; 
    margin-top: 0;
    margin-bottom: 0;
    text-align: center; 
    opacity: 0.8; 
  }
  
  p, button, input {
    font-size: 1.25em;
    line-height: 30px;
    background: none;
    color: #ffffff;
    margin: auto;
  }
  
  button {
    border-radius: 10px;
    border-color: #ffffff;
    transition: transform 0.3s ease;
  }
  
  #start-btn, #randomize-btn {
    border-width: 3px;
  }
  
  
  
  button:hover, button.selected, button.selected:disabled {
    background: #ffffff;
    color: #4289b5; 
    transform: scale(1.1); /* Button enlarges slightly on hover */
  }
  
  button:disabled {
    cursor: default;
    background: none;
    color: #eee;
    opacity: 0.5;
  }
  
  .game {
    margin: 80px auto 20px;
    width: 100%;
  }
  
  .board-container {
    display: flex;
    justify-content: center;
  }
  
  .board {
    position: relative;
    margin: 0px 0px 20px;
    width: 400px;
    height: 400px;
    padding: 0px 50px;
    display: grid;
    grid-template-columns: repeat(10, 1fr);  
    grid-template-rows: repeat(10, 1fr);
  }
  
  .board div {
    position: relative;
    box-sizing: border-box;      
    background: #f6f8f9;
    border: 1px solid #ddd;
    width: 40px;
    height: 40px;
    transition: opacity 1.0s;
  }
  
  .board div.hit {
    background: #9e0f10;
    transition: background-color 0.1s;
  }
  
  .board div.miss {
    background: #4289b5;
    transition: background-color 0.1s;
  }
  
  
  
  .board div.ship {
    background: #333;
    transition: background-color 0.1s;
  }
  
  .panel {
    border: 2px solid #333;
    border-radius: 20px;
    display: grid;
    height: 125px;
    width: 125px;
    padding: 10px;
    margin-top: auto;
    margin-bottom: auto;
    grid-template-columns: auto auto; 
    color: #4289b5;
    font-weight: bold;
    opacity: 0.8;
  }
  
  .panel > div {
    height: 20px;
    line-height: 20px;
    transition: opacity 0.3s;
  }
  
  .footer {
    width: 100%;
    display: flex;
    justify-content: center;
  }
  
  .footer-label {
    text-align: center;
    width: 500px;
    color: #4289b5;
    font-size: 30px;
    font-weight: bold;
    opacity: 0.8;
  }
  
  .opaque {
    transition: opacity 1.0s;
    opacity: 0.5;
  }