body {
  font-family: Arial, sans-serif;
  padding: 20px;
}
.controls {
  margin-bottom: 10px;
}
button, select {
  padding: 5px 10px;
  margin: 2px;
  cursor: pointer;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}
th, td {
  border: 1px solid #aaa;
  padding: 4px;
  text-align: center;
}
th input {
  width: 90%;
  padding: 2px;
}
h2 {
  color: darkblue;
  margin-top: 20px;
}
.editable {
  cursor: pointer;
  background-color: #f5f5f5;
}
.editable:hover {
  background-color: #e0e0e0;
}
.editable input {
  width: 100%;
  padding: 2px;
  box-sizing: border-box;
}
.add-row, .delete-row {
  color: white;
  border: none;
  padding: 3px 8px;
  cursor: pointer;
  margin: 2px;
  font-size: 12px;
}
.add-row {
  background-color: #4CAF50;
}
.add-row:hover {
  background-color: #45a049;
}
.delete-row {
  background-color: #f44336;
}
.delete-row:hover {
  background-color: #d32f2f;
}