html {
    scroll-behavior: smooth;
}
.menu-area {
    transition: all 1s;
}
.openbtn.active span {
    position: relative;
    width: 50%;
    height: 0.2em;
    left: 25%;
}
.openbtn.active>span:nth-child(1) {
    transform: translateY(0.8em) rotate(45deg);
}
.openbtn.active>span:nth-child(2) {
    opacity: 0;
}
.openbtn.active>span:nth-child(3) {
    transform: translateY(-0.8em) rotate(-45deg);
}
.menu {
    display: none;
    transition: all 1s;
}
.menu.active {
    display: block;
}
.pointer {
    cursor: pointer;
}
.swiper {
    height: 500px;
    width: 1200px;
    margin: 0 auto;
}
.swiper-slide img {
    width: 1200px;
}
.quiz-toi {display: none;}

.hintBtn {display: none;}

.hint {display: none;}

.answer {display: none;}

.answerBtn {display: none;}

.nextQuestion {display: none;}

.active {
    display: block;
}
.hide {
    display: none;
}

.dli-minus {
  display: inline-block;
  vertical-align: middle;
  color: #333;
  line-height: 1;
  width: 1em;
  height: 0.1em;
  background: currentColor;
  border-radius: 0.1em;
}

#introduction {
    border: 1px solid #ddd;
    border-top: none;
    padding: 8px;
    background-color: #fefefe;
}
.top {
    position: fixed;
    right: 0;
    bottom: 32px;
    background-color: #fefefe;
    border: solid #333 1px;
    border-radius: 3px;
    width: fit-content;
    padding: 8px;
    cursor: pointer;
}