.cover-text {
  position: absolute;
  top: 36%;
  left: 35%;
  transform: translate(-50%);
  font-size: 3em;
  font-weight: 700;
}

.teacher {
  left: unset;
  right: 0;
  bottom: 0;
  height: 60%;
  z-index: 10;
}
.cover-text {
  font-size: 1.5em;
}

.cover-text.txt2 {
  top: 45%;
}

.start {
  position: absolute;
  top: 54%;
  left: 23%;
  border-radius: 0.5rem;
  border: 3px solid #000;
  background: #3319d6;
  box-shadow: 0px -10px 4px 0px rgba(0, 0, 0, 0.25) inset,
    4px 5px 4px 0px rgba(0, 0, 0, 0.25);
  color: #fff;
  padding: 1% 5%;
  font-size: 1.5em;
  cursor: pointer;
  display: none;
}

.credit-link {
  width: 100%;
  position: absolute;
  bottom: 2%;
  font-size: 0.7em;
  left: 50%;
  transform: translate(-50%);
  color: #000;
}

.credit-link a {
  color: #000;
  text-decoration: underline;
}

iframe {
  width: 80%;
  height: 70%;
  overflow: hidden;
  top: 7%;
}

.tutorial-btn {
  position: absolute;
  bottom: 8%;
  width: 22%;
  height: 12%;
  left: 50%;
  transform: translateX(-50%);
  cursor: pointer;
  pointer-events: none;
}

.tutorial-btn img {
  width: 100%;
  height: 100%;
  object-fit: fill;
}

.tutorial-btn label {
  position: absolute;
  top: 16.5%;
  left: 18%;
  font-size: 1.3em;
  color: #000;
  cursor: pointer;
}

.help-video {
  border: 1px solid;
  height: 100%;
  width: 100%;
  position: absolute;
  inset: 0;
  margin: auto;
  display: grid;
  place-content: center;
  background-color: rgb(14 14 14 / 0.5);
  backdrop-filter: blur(4px);
  display: none;
  z-index: 1000;
}

.help-video .close-btn {
  position: absolute;
  top: 5%;
  right: 3%;
  cursor: pointer;
  width: 5%;
}

.help-video video {
  width: 90%;
  height: 95%;
  margin: auto;
}
.close-btn {
  position: absolute;
  z-index: 10000;
  height: 8%;
  right: 3%;
  top: 2%;
  display: none;
  cursor: pointer;
}

.help-text {
  width: 65%;
  margin: auto;
  border-radius: 0.8em;
  border: 0.2em solid #fff;
  background: #040404;
  padding: 2%;
  color: #fff;
  position: absolute;
  z-index: 10000;
  top: 2%;
  left: 50%;
  transform: translateX(-50%);
}