body {
  font-family: sans-serif;
  background: #0d1117;
  color: #c9d1d9;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
}
table {
  border-collapse: collapse;
  margin-top: 1rem;
}
td {
  width: 16px;
  height: 16px;
  border: 1px solid #30363d;
  cursor: pointer;
}
td.today {
  outline: 2px solid #ff9800; /* contour orange */
  outline-offset: -2px;       /* pour que le contour soit à l'intérieur de la case */
}
td.active {
  background: #238636;
}
td.disabled {
  background: repeating-linear-gradient(
    45deg,
    #2d333b,
    #2d333b 2px,
    #21262d 2px,
    #21262d 4px
  );
  opacity: 0.6;
  cursor: not-allowed;
  border: 1px solid #444c56;
}

button {
  margin: 1rem;
  padding: 0.5rem 1rem;
  background: #238636;
  border: none;
  border-radius: 5px;
  color: white;
  cursor: pointer;
}
button:hover {
  background: #2ea043;
}
textarea {
  width: 90%;
  height: 200px;
  background: #161b22;
  color: #c9d1d9;
  border: 1px solid #30363d;
  border-radius: 5px;
  padding: 0.5rem;
  font-family: monospace;
  font-size: 0.9rem;
}
th {
  font-size: 0.6rem;
  color: #8b949e;
  padding-bottom: 0.2rem;
}