body {
  font-family: Arial, sans-serif;
  background: #f2f2f2;
}

.container {
  width: 650px;
  margin: 40px auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
}

input {
  padding: 8px;
  margin: 5px 0;
}

.subject {
  display: flex;
  gap: 10px;
}

.subject input {
  flex: 1;
}

button {
  padding: 8px 12px;
  margin: 6px 4px;
  cursor: pointer;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

table, th, td {
  border: 1px solid #ccc;
}

th, td {
  padding: 8px;
  text-align: center;
}

.fail {
  color: red;
  font-weight: bold;
}