body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
h1 {
  color: #333;
}
.user-button {
  margin: 5px;
  padding: 10px;
  border: none;
  background-color: #4caf50;
  color: white;
  cursor: pointer;
  border-radius: 5px;
  transition: background-color 0.3s ease;
}
.user-button:hover {
  background-color: #45a049;
}
.user-button.active {
  background-color: #388e3c;
}
table {
  width: 90%;
  max-width: 700px;
  border-collapse: collapse;
  margin: 20px auto;
  background-color: white;
  box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}
th,
td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: center;
}
th {
  background-color: #4caf50;
  color: white;
}
#today {
  background-color: #d0d0d0;
}
.highlight {
  font-weight: bold;
}
#dayColumn {
  background-color: #4caf50;
  color: white;
  font-weight: bold;
}