:root {
    --main-bg: #2c2c2c;
    --sec-bg: #282828;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    color: white;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    width: 100%;
    height: 100%;
  
    background: #121212;
    background: linear-gradient(
      135deg,
      var(--main-bg) 25%,
      var(--sec-bg) 25%,
      var(--sec-bg) 50%,
      var(--main-bg) 50%,
      var(--main-bg) 75%,
      var(--sec-bg) 75%,
      var(--sec-bg)
    );
    background-size: 40px 40px;
  
    animation: move 4s linear infinite;
}
  
@keyframes move {
    0% {
    background-position: 0 0;
    }
    100% {
    background-position: 40px 40px;
    }
}  

.container {
    text-align: center;
}

h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

input {
    padding: 10px;
    border: none;
    border-radius: 5px;
    margin-bottom: 10px;
    font-size: 16px;
}

button {
    background: #007bff;
    color: white;
    border: none;
    padding: 10px 15px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}

#timer {
    font-size: 10em;
    font-weight: bold;
    margin-top: 10px;
}

#milliseconds {
    color: #8a8a8a;
    bottom: 0;
}