body {
     font-family: Arial, sans-serif;
     display: flex;
     justify-content: center;
     align-items: center;
     height: 100vh;
     margin: 0;
     background-color: #f0f8ff;
 }
 
 .container {
     width: 90%;
     max-width: 500px;
     height: auto;
     text-align: center;
     box-sizing: border-box;
     border: 1px solid black;
     border-radius: 10px;
     padding: 20px;
     background-color: #ffffff;
     box-shadow: 0 4px 6px rgba(0, 0, 0, 1.5);
 }
 
 #time {
     font-size: 36px;
     margin-bottom: 20px;
     font-weight: bold;
 }
 
 .controller {
     padding-top: 20px;
 }
 
 .controller button {
     margin: 5px;
     padding: 10px 15px;
     font-size: 14px;
     cursor: pointer;
     border: none;
     border-radius: 5px;
     background-color: #007bff;
     color: white;
     transition: transform 0.2s ease, background-color 0.3s ease, box-shadow 0.2s ease;
 }
 
 .controller button:hover {
     transform: scale(1.05);
     background-color: #0056b3;
     box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
 }
 
 .controller button:active {
     transform: scale(0.95);
     background-color: #003f7f;
 }
 
 #laps {
     margin-top: 20px;
     list-style: none;
     padding: 0;
     max-height: 150px;
     overflow-y: auto;
     border-top: 1px solid #ccc;
     padding-top: 10px;
 }
 
 #laps li {
     margin: 5px 0;
     font-size: 16px;
 }
 
 @media (min-width: 600px) {
     .container {
         width: 80%;
     }
     #time {
         font-size: 42px;
     }
     .controller button {
         font-size: 16px;
     }
     #laps li {
         font-size: 18px;
     }
 }
 
 @media (min-width: 992px) {
     .container {
         width: 60%;
     }
     #time {
         font-size: 48px;
     }
     .controller button {
         font-size: 18px;
     }
     #laps li {
         font-size: 20px;
     }
 }
 
 @media (min-width: 1200px) {
     .container {
         width: 500px;
     }
     #time {
         font-size: 48px;
     }
     .controller button {
         font-size: 18px;
     }
     #laps li {
         font-size: 20px;
     }
 }