body {
  margin: 0;
  font-family: Arial, sans-serif;
}
.toolbar {
  display: flex;
  padding: 8px;
  background-color: #f1f1f1;
  align-items: center;
}
.toolbar button, .toolbar input {
  margin-right: 4px;
  padding: 6px;
}
.toolbar input {
  flex: 1;
}
.content {
  height: calc(100vh - 42px);
}
.content iframe {
  width: 100%;
  height: 100%;
  border: none;
}