.ex1 {
  display: flex;
  justify-content: space-between;
  padding:0 4.8rem;
}
.ex1--item{
  display: flex;
  align-items: center;
  gap: 1.6rem;
}
.ex1--item > b{
  font-size: 2rem;
  font-weight: 400;
  color: #000;
}
.ex1--item > div {
  display: flex;
  gap:3.2rem;
  align-items: center;
}
.ex1--item img{display: block;}
.ex1--img1{height: 3rem;}
.ex1--img2{height: 5.9rem;}
.ex1--img3{height: 3rem;}

.ex1--img1,
.ex1--img2,
.ex1--img3{opacity: 0; transition: opacity .3s ease;}
.ex1--img1[data-toggle-state="true"],
.ex1--img2[data-toggle-state="true"],
.ex1--img3[data-toggle-state="true"]{opacity: 1;}
[data-toggle-object][data-toggle-state="true"] {pointer-events: none !important; opacity: 0;}
.page-desc .finger {padding-right:0;margin-right:-.4rem}
.page-desc .finger button {display:none}
.page-desc .finger.on button {display:block}
.text-justify {text-align:justify;}

[data-indent] {text-align: justify;}

.katex{font-size: 2.2rem;}