body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
}
table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 20px;
}
th, td {
  border: 1px solid #ccc;
  padding: 8px;
  text-align: left;
}
th {
  background-color: #f2f2f2;
}
input, select, button {
  padding: 6px;
  margin: 5px;
}
#login, #main {
  max-width: 800px;
  margin: 0 auto;
}
#timer {
  text-align: right;
  margin-bottom: 10px;
}
#history, #logs {
  border: 1px solid #ccc;
  padding: 10px;
  max-height: 300px;
  overflow-y: auto;
}