* {
  /*    border: solid 1px red; */
  font-family: "Noto Sans TC", sans-serif;
}
/* .navbar-nav {
  margin-left: 200px;
} */
.container {
  padding-top: 50px;
}
.ncyu {
  padding-top: 80px;
}
section {
  padding-top: 80px;
}
section#s1 {
  background-color: #fcead2;
}
section#s2 {
  background-color: #fae3f2;
}
section#s3 {
  background-color: #faf9e1;
  padding-bottom: 100px;
}
section#s4 {
  background-color: #f3e3fa;
}
.toTop-arrow {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  margin: 0;
  border: 0;
  border-radius: 33%;
  opacity: 0.6;
  background: #000;
  cursor: pointer;
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  display: none;
}
.toTop-arrow::before,
.toTop-arrow::after {
  width: 18px;
  height: 5px;
  border-radius: 3px;
  background: #f90;
  position: absolute;
  content: "";
}
.toTop-arrow::before {
  transform: rotate(-45deg) translate(0, -50%);
  left: 0.5rem;
}
.toTop-arrow::after {
  transform: rotate(45deg) translate(0, -50%);
  right: 0.5rem;
}
.toTop-arrow:focus {
  outline: none;
}