.body {
    width:1000px;
    margin:0 auto;
 }

.content-container {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
}
.content-container .left-nav-wrapper {
    width: 270px;
    height: 100vh;
    /*background: #dfdfdf;
    overflow-y: auto;*/

}
.content-container ul.navigation-panel {
    padding: 0px;
    margin: 0;
}
.content-container .left-nav-wrapper ul li {
    padding: 10px;
    list-style: none;
    border-bottom: 1px solid gray;
    background: #c1c1c1;
    cursor: pointer;
}

.content-container .left-nav-wrapper ul li.active {
    background: #efefef;
}
.content-container .right-content-wrapper {
    width: 100%;
    padding-left: 15px;
}

.content-container .right-content-wrapper p {
  margin-top: 0px
}
.content-container .right-content-wrapper .content {
  display: none;
}
.cross-btn {
    display: none;
}


@media (max-width: 560px) {
    .content-container {
        position: relative;
    }

    .cross-btn {
        display: block;
        padding: 5px 8px;
        cursor: pointer;
        width: 20px;
        height: 20px;
        background: #dfdfdf;
    }

    .content-container .left-nav-wrapper {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
        background: #fff0;
        position: absolute;
        left: -250px;
        transition: all 0.5s;
    }

    .content-container .right-content-wrapper {
        margin-left: 25px;
    }

    ul.navigation-panel {
        width: 100%;
        background: #dfdfdf;
        margin-top: 0;
    }
    #left-panel {
        left: -250px;
    }


}