body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  color: #333;
}
.container {
  max-width: 500px;
  margin: 50px auto;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  text-align: center;
}
#targetUrl {
  width: 100%;
  padding: 10px;
  margin-bottom: 15px;
  box-sizing: border-box;
}
.buttons-group {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 10px 0;
}
.buttons-group button {
  padding: 8px 16px;
  border: none;
  border-radius: 4px;
  background: #007bff;
  color: #fff;
  cursor: pointer;
}
.controls {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 20px 0;
}
.controls button {
  flex: 1 1 0;
  padding: 10px 0;
  font-size: 1em;
  text-align: center;
  border: none;
  border-radius: 4px;
  color: #fff;
  cursor: pointer;
  max-width: 120px;
}
.controls button#stop {
  background: #007bff;
}
.controls button#reset {
  background: #28a745;
}
#statsChart {
  width: 100% !important;
  height: 300px !important;
}