* {
  font-family: Arial, Helvetica, sans-serif;
}

html, body {
  margin: 0;
  border: 0;
  padding: 0;
  background-color: black;
  color: white;
}

img {
  filter: brightness(.8) contrast(1.2);
}

main {
  margin: 0 auto;
  padding: 20px;
}

main > h1 {
  text-align: center;
  font-size: 3.5em;
}
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.tab {
    padding: 10px 20px;
    background: #eee;
    border: none;
    cursor: pointer;
    font-size: 16px;
    border-radius: 4px;
}

.tab.active {
    background: #0078d4;
    color: white;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.video-frame {
    width: 800px;
    height: 450px;
    border: none;
}