body {
    width: 100%;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /*background-color: #b3cb9b;*/
    font-family: Arial, 'Segoe print', Tahoma, Geneva, Verdana, sans-serif;
    position: relative;
    margin-bottom: 150px;
    color: green;
}

.bg-success{
    background-color: Green !important;
}
h1 {
    margin: 10px;
}

.tab {
    justify-content: center;
}

a {
    color: black !important;
}
.orale{
    margin: auto;
    padding: 20px;
}
 .video-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 1.5rem;
}

.btn {
  padding: 0.75rem 1rem;
  border: 1px solid #333;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 0.5rem;
  width: 100%;       /* plein écran mobile */
  max-width: 500px;  /* limite desktop */
  box-sizing: border-box;
}

.iframe-wrap {
  display: none;
  margin-top: 0.5rem;
  width: 100%;
  max-width: 935px;
}

iframe {
  width: 100%;
  height: 315px;
  border: 0;
  border-radius: 8px;
}

@media (max-width: 600px) {
  iframe { height: 200px; }
}