.main-content {
    display: flex;
    max-width: 1140px;
    margin: 0 auto;
    padding: 25px 20px;
    min-height: 768px;
}

.posts {
    position: sticky;
    list-style: none;
    flex: 1 1 auto;
    max-width: 800px;
}

.sider {
    margin-left: 20px;
    width: 288px;
}

.page_nav {
    width: fit-content ;
    padding: 0 10px;
    line-height: 50px;
    max-width: 100%;
    height: 50px;
    text-align: center;
    margin: 0 auto;
    background-color: white;
    border-radius: 50vh;
    align-items: center;
    justify-content: center;
    border: 1px solid rgb(244, 233, 233);
}

.page_nav:hover {
    box-shadow: 0.5px 0.5px 5px rgb(228, 213, 213),
        -0.5px -0.5px 5px rgb(228, 213, 213);
    transition: box-shadow 0.3s ease-in-out;
}

.page_nav > * {
    margin: 0 5px;
}

.page_nav > span {
    font-weight: bolder;
}

.page_nav {
    margin-bottom: 20px;
}

@media only screen and (max-width: 968px) {
    .main-content {
        display: block;
    }

    .posts {
        max-width: unset;
    }

    .posts>.post_box {
        width: 100%;
    }
    .sider {
        width: 100%;
        margin: 0;
    }
}

.post_box ul {
    margin-left: 20px;
}

.post_box ul li {
    margin:7px 0;
    line-height: 1.5em;
}