html {
  scroll-behavior: smooth;
}
.logo {
  width: 40px;
  height: 40px;
  line-height: 80px;
  margin-top: 10px;
  margin-left: 10px;
}


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

hr {
  border:none;
  border-top:1px dotted black;
  color:#fff;
  background-color:#fff;
  height:1px;
  width:100%;
}