body {
  font-family: Arial, sans-serif;
  text-align: center;
  background-color: #f4f4f9;
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

h1 {
  margin-top: 20px;
  color: #333;
}

.tab {
  display: flex;
  justify-content: center;
  border-bottom: 1px solid #ccc;
  background-color: #f1f1f1;
  position: relative;
  top: 0;
  width: 100%;
}

.tab button {
  background-color: inherit;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 14px 16px;
  transition: 0.3s;
}

.tab button:hover {
  background-color: #ddd;
}

.tab button.active {
  background-color: #ccc;
}

.tabcontent {
  display: none;
  flex-grow: 1;
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
}