body{
    background-color: darkgray;
}
.container-center,footer{
    /* width: 720px; */
    display: block;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
}
footer{
    font-size: 16px;
    text-align: center;
    line-height: 30px;
    background-color: rgb(225, 246, 204);
    padding-top: 10px;
}
.container-main{
    display: flex;
    background-image: url("../images/robert-arnar-0i-JxRlfP7c-unsplash.jpg");
    background-size:cover;
    /* background-repeat:no-repeat;
    background-attachment:fixed;
    background-position:center; */
    /* align-items: center; */
    position: relative;
    height: 100vh;
    
}
.container-left{

}

.container-right{
    position:absolute; 
    /* z-index: 10; */
    right: -250px;
    height: 100vh;
}
.container-middle{
    position:absolute;
    /* z-index: 19;  */
    right: 0px;
    /* top:300px; */
    /* height: 170px; */
    border-top:  3px solid blueviolet;
    border-bottom:  3px solid blueviolet;
    border-left:  3px solid blueviolet;
    background-color: blueviolet;
    border-top-left-radius: 25px;
    border-bottom-left-radius: 25px;
    font-size: 20px;
}

.container-middle p{
    width: 30px;
    padding: 25px 5px 10px 5px;
    /* align-items: center; */

    /* margin-right: -3px; */
    /* line-height: 170px; */
}
.container-middle:hover{
    background-color: rgb(107, 23, 185);
    border-top:  3px solid rgb(107, 23, 185);
    border-bottom:  3px solid rgb(107, 23, 185);
    border-left:  3px solid rgb(107, 23, 185);
    color: #fff;
}

.container-middle.active{
    right: 250px;
    transition: 1s;    
}

.container-right.active{
/* #sidebar.active{ */
    /* display:block; */
    /* float: left; */
    right: 0px;
    width: 250px;
    height: 100%;
    background-color: blueviolet;
    color: #fff;
    transition: 1s;
}

#sidebar p{
    font-size: 30px;
    text-align: center;
    font-style: italic;
}

#sidebar ul li a,#sidebar ul li button,#guest{
    padding: 30px 20px 30px 20px;
    font-size: 18px;
    display: block;
    border-bottom: 1px dashed #000;
    text-decoration: none;
    color:#fff;
}


/* 登出 */
#sidebar ul li button{
    /* margin-top: 300px; */
    background-color: blueviolet;
    width: 100%;
    text-align-last: right;
    border: none;
    border-bottom: 1px dashed #000;
    border-top: 1px dashed #000;
}

/* #sidebar ul li{
    border-bottom: 1px dashed #000;
} */
#sidebar ul li a:hover ,#guest button:hover,#sidebar ul li button:hover{
    color:blueviolet;
    background-color: #fff;
}




@media (max-width:720px) {
    .container-center,footer{
        /* width: 540px; */
        display: block;
        margin-left: auto;
        margin-right: auto;
    }
    #sidebar.active{
        display: block;
        /* width: 180px; */
        height: 100vh;
        background-color: blueviolet;
        color: #fff;
        /* transition: 1s; */
        /* margin-right: -200px; */
    }


    .container-right{
        right: -200px;
    }
    .container-middle.active{
        right: 200px;
    }
    .container-right.active{
        width: 200px;
    }


    
    #sidebar p{
        font-size: 16px;
        text-align: center;
        /* padding: 10px; */
        /* padding-right: 20px; */
        font-style: italic;
    }
    
    #sidebar ul li a,#guest{
        padding: 10px;
        font-size: 14px;
        display: block;
        border-bottom: 1px dashed #000;
        /* border-radius: 20px; */
        text-decoration: none;
        color:#fff;
    }

    footer{
        font-size: 12px;
    }
}