/* Light theme styles */
:root {
  --background-color: #fff;
  --text-color: #000;
}

body {
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: Arial, sans-serif;
}

title {
  color: white;
  position: center;
}

#timer {
  font-size: 2em;
  margin-bottom: 1em;
}

button {
  margin-right: 10px;
}

.session {
  margin-bottom: 20px;
}

.session-description {
  margin-bottom: 10px;
}

.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.tab-btn {
  padding: 10px 20px;
  background-color: rgb(139, 133, 140);
  color: #fff;
  text-decoration: none;
  border-radius: 5px 5px 0 0;
  margin-right: 10px;
  font-size: 14px;
  letter-spacing: 2px;
  font-weight: 400;
  text-transform: uppercase;
}

.tab-btn:hover {
  background-color: #57595b;
}

.tab-btn.active {
  background-color: #448383;
}

.tab-btn:not(.active) {
  border-bottom: 2px solid transparent;
}

.tab-btn:last-child {
  margin-right: 0;
}

/* Dark theme styles */
body.dark-theme {
  --background-color: #000;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  overflow: hidden;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.comment {
  border: 1px solid #ccc;
  padding: 10px;
  margin-bottom: 10px;
  border-radius: 2px;
}

.comment i {
  font-style: italic;
}