#nav{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: white;
    /* padding: 20px 80px; */
    box-shadow: 0 5px 15px rgba(0,0 0,0,0.06);
    position:fixed;
    top: 0px;
    width: 100%;
    z-index: 9999;
    border-bottom: 3px solid #0C489E;
}
#navbar div{
    display: flex;
    align-items: center;
    justify-content: center;
    
}
#navbar div li{
    list-style: none;   
    padding: 0 20px;
    position: relative;
}
#navbar div li a{
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    font-family: 微軟正黑體;
    color: black;
    transition: 0.3s ease-in-out;
}
#navbar div li a:hover{
    color: #0C489E;
}
#navbar div li a:hover::after,
#navbar div li a:focus::after{
    content: "";
    width: 80%;
    height: 2px;
    background:#0C489E;
    position: absolute;
    bottom: 3px;
    left: 20px;
}
#navbar div li ul {
  background: white;
  visibility: hidden;
  opacity: 0;
  min-width: 18rem;
  position: absolute;
  /* transition: all 0.5s ease; */
  left: 0;
  display: none;
  padding-left: 0px;
  /* border: 1px solid #0C489E; */
  background-clip: padding-box;
  border: 1px solid rgba(0,0,0,.15);
  border-radius: 0.25rem;
}
#navbar  div li:hover > ul,
#navbar  div li:focus-within > ul,
#navbar  div li ul:hover,
#navbar  div li ul:focus {
  visibility: visible;
  opacity: 1;
  display: block
}
#systemTitle{
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: 600;
    color: #0C489E;
    transition: 0.3s ease-in-out;
    font-family: 微軟正黑體;
    text-align: center;
}
#mobileTitle{
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    color: #0C489E;
    transition: 0.3s ease-in-out;
    font-family: 微軟正黑體;
    text-align: center;
}
#sidebar{
    font-size: 1.3rem;
    font-weight: 600;
    font-family: 微軟正黑體;
}
#sidebartop{
    align-items: center;
    justify-content: center;
    padding: 0;
    display: flex;
}
#sidebarbottom{
    align-items: center;
    justify-content: center;
    padding: 0;
    display: flex;
}
#sidebar li{
    list-style: none;   
    padding: 0 20px;
    position: relative;
    text-align: left;
}
#sidebar li a{
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: 600;
    font-family: 微軟正黑體;
    color: black;
    transition: 0.3s ease-in-out;
}
#sidebar li a:hover{
    color: #0C489E;
}
#sidebar div li ul {
    background: white;
    visibility: hidden;
    opacity: 0;
    min-width: 16rem;
    position: absolute;
    /* transition: all 0.5s ease; */
    left: 0;
    display: none;
    padding-left: 0px;
    /* border: 1px solid #0C489E; */
  }
  #sidebar  div li:hover > ul,
  #sidebar  div li:focus-within > ul,
  #sidebar  div li ul:hover,
  #sidebar  div li ul:focus {
    visibility: visible;
    opacity: 1;
    display: block
  }