我的底部边框在屏幕宽度 <700 像素时不可见。如何在页面底部和底部边框之间添加一些 space？

Question

从上图@屏幕宽度700px以下的2张图片可以看出，我的上边框可以清楚地看到，而我的下边框卡在页面底部，无法查看。知道如何解决这个问题吗？我想在网页底部和我的底部边框之间有一些 space。

即使在调整主要元素或最外层 div 容器的边距后，我仍然无法在网页的底部边距和底端之间获得一些额外的 space 来呈现.

下面附上我的代码：

CSS:

main {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    border: 1px solid grey;
    width: 70vw;
    border-radius: 5px;
    margin: auto;
    background-color: white;
}

section {
    /* background-color: greenyellow; */
    height: 400px;
    width: 350px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    margin: 10px 0;
}

div {
    /* background-color: red; */

    /* border-color: 3px solid black; */
    display: inline;
    text-align: center;  
    padding: 0 20px;
}

img#img1 {
    height: 100px;
    width: 100px;
    margin-bottom: 10px;
}

section.panel {
    border-right: 1px solid grey;
}

a {
    text-transform: uppercase;  
    font-family: 'Merriweather', serif;
    text-decoration: none;
    font-size: 0.8rem;
}

#main_container {
    display: flex;
    align-items: center;
    height: 100vh;
}

button {
    margin-bottom: 10px;
    text-transform: uppercase;  
    font-family: 'Merriweather', serif;
    padding: 8px 13px;
    border-radius: 5px;
}

a.price {
    font-weight: bold;
    font-size: 1.7rem;
}

button:hover {
    background-color: skyblue;
}

hr {
    width: 50%;
}

span {
    display: block;
    height: 8px;
    margin-bottom: 8px;
}

@media (max-width: 700px) {
    main {
        display: flex;
        flex-direction: column;
        margin-bottom: 100px;
    }

    section {
        /* background-color: greenyellow; */
        /* height: 400px;
        width: 350px; */
        display: flex;
        width: 70vw;   
    }

    section.panel {
        border-right: none;
        border-bottom: 1px solid grey;
    }

    div {
        flex-wrap: wrap;
    }

    button {
        margin-bottom: 30px;
    }

    #main_container {
        margin-bottom: 10px;
        height: 0px;
    }
}

HTML:

<div id="main_container">
    <main>
        <section class="panel" id="panel1">
            <img id="img1" src="rocket.gif" alt=""><a href="">Personal</a> 
            <hr>
            <div><a href="">Custom Domain</a></div>
            <hr>
            <div><a href="">Sleeps After 30 Mins Of Inactivity</a></div>
            <hr>
            <div><a class="price" href="">Free</a></div>
            <div>
                <button>SIGN UP</button>
            </div>
        </section>
        <section class="panel" id="panel2">
            <img id="img1" src="target.gif" alt=""><a href="">Small Team</a> 
            <hr>
            <div><a href="">Never Sleeps</a></div>
            <hr>
            <div><a href="">Multiple Workers For More Powerful Apps</a></div>
            <hr>
            <div><a class="price" href="">0</a></div>
            <div>
                <button>FREE TRIAL</button>
            </div>
        </section>
        <section id="panel3">
            <img id="img1" src="presentation.gif" alt=""><a href="">Enterprise</a> 
            <hr>
            <div><a href="">Dedicated</a></div>
            <hr>
            <div><a href="">Simple Horizontal Scalability</a></div>
            <hr>
            <div><a class="price" href="">0</a></div>
            <div>
                <button id="lastbutton">FREE TRIAL</button>
            </div>
        </section>
    </main>
</div>

Answer 1

将#main_container设置为高度：100%；

Answer 2

对 <main> 的顶部和底部应用填充。这样做将使 main 相对于其中的任何内容始终流畅。

顶部和底部仅 50 像素内边距。

main{
  padding: 50px 0;
}

我的底部边框在屏幕宽度 <700 像素时不可见。如何在页面底部和底部边框之间添加一些 space？

My bottom border is not viewable @ screen width <700 px. How do I add some space between the bottom of the page and my bottom border?

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css

border