body {
  font-family: sans-serif;
  background: #f5f5f5;
  padding: 20px;
}

h1 {
  margin-bottom: 10px;
}

.kassza, .vasarlo {
  margin-bottom: 20px;
  background: #fff;
  padding: 15px;
  border-radius: 8px;
  border: 1px solid #ccc;
}

button {
  margin: 5px 5px 5px 0;
  padding: 8px 12px;
  cursor: pointer;
}

.cimletek button {
  min-width: 70px;
}

.output {
  margin-top: 10px;
  padding: 10px;
  background: #eef;
  border-radius: 4px;
}