html { font-size: 85%; /* 12px */ }
body {
    height: 100%;
    font-size: 1rem; /* 12px */
}


body {
    font-family: "Helvetica Neue", Arial, STHeiti, "Microsoft JhengHei", 微軟正黑體, sans-serif;
}


h1, .h1 {
  font-size: 2rem;
}

h2, .h2 {
  font-size: 1.8rem;
}

h3,.h3 {
  font-size: 1.6rem;
}

h4, .h4 {
  font-size: 1.4rem;
}

h5, .h5 {
  font-size: 1.2rem;
}

h6, .h6 {
  font-size: 1rem;
}

#return-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgb(0, 0, 0);
    background: rgba(0, 0, 0, 0.7);
    width: 50px;
    height: 50px;
    display: block;
    text-decoration: none;
    -webkit-border-radius: 35px;
    -moz-border-radius: 35px;
    border-radius: 35px;
    display: none;
    -webkit-transition: all 0.3s linear;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}
#return-to-top i {
    color: #fff;
    margin: 0;
    position: relative;
    left: 16px;
    top: 13px;
    font-size: 19px;
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}
#return-to-top:hover {
    background: rgba(0, 0, 0, 0.9);
}
#return-to-top:hover i {
    color: #fff;
    top: 5px;
}