html {
  scroll-behavior: smooth;
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.nav {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 1000px;
  font-family: "Times New Roman", Arial;
  font-size: 16px;
}

.gotopbtn {
  position: fixed;
  width: 50px;
  height: 50px;
  background: #e30947;
  bottom: 40px;
  right: 40px;
  text-decoration: none;
  text-align: center;
  line-height: 50px;
  color: white;
  font-size: 32px;
}