#body {
    background-image: url(../pic/lionsbg.jpg);
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

/*--------main--------*/

#mainsection table td {
    font-size: large;
}

.accordion {
    --bs-accordion-bg: #e9ecef;
}

#mainsection table .pointer {
    cursor: pointer;
    color: rgb(34, 20, 102);
    font-weight:bold;
    font-family: "Noto Sans CJK TC", "Microsoft JhengHei", "PingFang", "STHeiti", sans-serif, serif;
}


/*--------header--------*/

header {
    background-color: rgba(208, 221, 228, 1);
}

header li {
    margin: 0 15px;
}

header img {
    width: 300px;
}

header .navbar-collapse {
    flex-grow: 0;
    font-family: 'Noto Sans TC', sans-serif;
    font-weight: bold;
    font-size: 18px;
}

.navbar .navbar-nav .nav-link {
    color: #555555;
  }
  .navbar .navbar-nav .nav-link:hover {
    color: #1a1a1a;
  }
  .navbar .navbar-nav .nav-item {
    position: relative;
  }
  .navbar .navbar-nav .nav-item::after {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    background-color: #000000;
    width: 0%;
    content: "";
    height: 4px;
    transition: all 0.5s;
  }

  .navbar .navbar-nav .nav-item:hover::after {
    width: 100%;
  }


/*--------STEM--------*/


.mainjumbotron {
    padding: 2rem 1rem;
    background-color: rgba(255, 255, 255, 0.75);
    border-radius: .3rem;
    height: auto;
}

.jumbotron {
    padding: 2rem 1rem;
    margin-bottom: 2rem;
    background-image: url(../pic/tbg3.jpg);
    background-repeat: no-repeat;
    background-size: 100% 100%;
    border-radius: .3rem;
    height: 300px;
}

.tcenter {
    text-align: center;
    line-height: 24px;
    margin-top: 100px;
    color: white;
}

.display-5{
    line-height: 1.5;
}

.margint-75 {
    margin-top: 65px;
}

.center{
    text-align: center;
}


/*--------RWD--------*/


@media only screen and (max-width: 450px) {
    header img {
        width: 250px;
    }
}

@media only screen and (max-width: 1200px) {
    .jumbotron {
        height: 250px;
    }

    .tcenter {
        margin-top: 70px;
    }
}

@media only screen and (max-width: 1000px) {
    .jumbotron {
        height: 200px;
    }

    .tcenter {
        margin-top: 55px;
    }
}


@media only screen and (max-width: 850px) {
    .jumbotron {
        height: 150px;
    }

    .tcenter {
        margin-top: 25px;
    }

    #body {
    background-image: url(../pic/lionsbgl.jpg);

    }
}

@media only screen and (max-width: 500px) {
    .jumbotron {
        height: 110px;
    }

    .tcenter {
        margin-top: 10px;
    }
}