#slide-nav {
    display: flex;
    /* flex-direction: column; */
    align-items: center;
    justify-content: center;
    /*height: 100vh;*/
    margin: 0;
    overflow: hidden;
    display: flex;
    width: 100%;
}

.main-no-display {
    display: block;
    transition: display 0.5s;
}

.main-no-display.main-active {
    display: none;
}

.panel h3 {
    position: absolute;
    font-size: 24px;
    bottom: 20px;
    left: 10px;
    margin: 0;
    opacity: 1;
    width: 80%;
}

.panel.active h3 {
    opacity: 1;
    transition: opacity 0.3s ease-in 0.3s;

    left: 35px;
    width: 100%;
}

.panel.active {
    /* 初始弹性盒子宽度值 */
    flex: 0.5;
}

#btn-container {
    float: right;
    text-align: right;
}

.back-button {
    margin: 1rem 1rem 0 0;
    text-align: center;
    width: 5rem;
    display: inline-block;
    padding: 0.3rem;
    text-decoration: none;
    border: 1px solid #ccc;
    border-radius: 4px;
    background-color: #0789ee;
}

#btn-container .back-button:hover {
    text-decoration: none;
    background-color: #034273;
}

#btn-container a{
    color: #FFFFFF;
    text-decoration: none;
}

#nav {
    float: left;
    font-size: 1rem;
    margin: 1.3rem 1rem;
    color:  #496a7c;
}

#nav a {
    text-decoration: none;
    color: #496a7c;
}

#nav a:hover {
    text-decoration: none;
    cursor: pointer;
    color: #003760;
}

.inactive{
    filter: blur(10px);
    transition: filter 0.5s;
}