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如何占满一屏幕余下的部分

<!doctype html><html lang="en"><head>    <meta charset="UTF-8">    <title>我的弹性盒布局</title>    <meta name="viewport" content="width=device-width,initial-scale=1.0"/>    <link rel="stylesheet" href="css/style.css"/><style>@import "m_reset.css";.fl {  float: left;}.fr {  float: right;}.m {  margin: 0 auto;}.container2,html,body {  width: 100%;  height: 100%;}.container2 {  width: 100%;  height: 100%;  display: -webkit-box;  -webkit-box-orient: vertical;}#video {  width: 100%;  height: auto;  background: #ff0000;}.section2 {  -webkit-box-flex: 1;}.section2 #video_bottom {  width: 96%;  height: auto;  margin-left: 2%;}.section2 .video_title {  width: 100%;  height: 40px;  -webkit-box-flex: 1;  line-height: 40px;}.section2 .video_title #red_text {  font-size: 14px;  font-weight: 400;}.section2 .video_parameter {  width: 100%;  height: auto;  border-top: 1px solid #ff0000;  padding-top: 5px;  padding-bottom: 5px;}.section2 .video_desc {  width: 100%;  height: auto;  border-top: 1px solid #ff0000;  padding-top: 5px;}/*背景图*/#mountain_view {  background: url("背景图地址");  background-position: center center;  background-size: cover;  height: 100%;}</style></head><body>        <div class="container2">            <!--视频区start-->            <video id="video" controls="controls" poster="./合欢山风光.jpg">                您的浏览器不支持 video 标签。                <!--source 元素可以链接不同的视频文件。浏览器将使用第一个可识别的格式。-->                <source src="视频地址" type="video/mp4">            </video>            <!--视频区end-->            <div class="section2" id="mountain_view">                <div id="video_bottom">                    <!--视频标题start-->                    <div class="video_title">                        <span id="red_text">视频名称</span>                    </div>                    <!--视频标题end-->                    <!--视频参数区start-->                    <div class="video_parameter">                        <p>视频参数</p>                        <p>拍摄间隔:5分钟</p>                        <p>播放速度:10帧/秒</p>                        <p>拍摄模式:夜晚</p>                    </div>                    <!--视频参数区end-->                    <!--视频描述区start-->                    <div class="video_desc">                        视频信息描述                    </div>                    <!--视频描述区end-->                </div>            </div>        </div></body></html>

 

另附上m_reset.css

@charset "utf-8";body, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, form, fieldset, legend, button, input, textarea, th, td { margin:0; padding:0 }body, button, input, select, textarea {font:12px/1.5 "\5FAE\8F6F\96C5\9ED1", arial ; *line-height:1.5}h1, h2, h3, h4, h5, h6 {font-size:100%; font-weight: normal;}address, cite, dfn, em, var {font-style:normal;}code, kbd, pre, samp {font-family:courier new, courier, monospace;}ul, ol {list-style:none;}fieldset, img {border:0}table {border-collapse:collapse;border-spacing:0;}input, button, textarea, select, optgroup, option {font-family: inherit;font-size: inherit;font-style: inherit;font-weight: inherit;font-size:100%;}div:after, ul:after, dl:after,.clearfix:after { content:""; display:block; clear:both; height:0; visibility:hidden;}/****/abbr, article, aside, audio, canvas, datalist, details, figure, footer, header, hgroup, menu, nav, output, progress, section, video {display:block;margin:0;padding:0}i,u,b,em,span,small{ font-weight:normal; font-style:normal;}html,body {height: 100%}/****/html {font-size: 62.5%;} body {    -webkit-tap-highlight-color: rgba(255, 255, 255, 0);     -webkit-user-select: none;        user-select: none;    -moz-user-focus: none;    -moz-user-select: none;}a{text-decoration: none;}h2{ margin:0; padding: 0;}ul{word-spacing: -4px;}

 

如何占满一屏幕余下的部分