.video {
    margin-top:30px;
    margin-bottom:10px;
}

.video_2{
    margin: auto;
 	display: block;
}

.video_2 img{
	width: 100%;
}

.class_cai {
    margin-bottom:10px;
    font-size:40px;
}
.middle {
    position: relative;
    padding: 2.2em 0;
    max-width: 1000px;
    margin: 0 auto;
    padding-left: 50px;
}
.videotitle {
    text-align: left;
    margin: 2em 0;
    padding-left: 20px;
    border-left: 4px solid #42b983;
    font-size: 1.5em;

}
.download {
    background-color: rgb(248, 255, 254);
    border: 1px solid #ccc;
    width: 1000px;
    border-radius: 5px;
    font-size: 18px;
    font-weight: 500;
    text-indent: 20px;
    height: 60px;
    line-height: 60px
}
.button {
    cursor: pointer;
    float: right;
    background-color:rgb(43, 195, 172) ;
    color: #fff;
    border-radius: 5px;
    margin-right: 10px;
    width: 80px;
    display: inline-block;
    text-align: center;
    text-indent: 0;
    height: 40px;
    line-height: 40px;
    position: relative;
    top: 10px;
}
a:hover {
    color: #d63200;
}
.title-1 {
    color: #273849;
    font-weight: 600;
    font-size: 1.17em;
    padding: 40px 0 30px 0;
}
.title-1::before {
    content: "#";
    color: #42b983;
    position: absolute;
    left: 25px;
    margin-top: 0.15em;
    padding-right: 0.5em;
    font-size: 1.2em;
    line-height: 1;
    font-weight: bold;
}
.title-p {
    line-height: 1.6em;
    margin: 1.2em 0 -1.2em;
    padding-bottom: 1.2em;
    color: #304455;
}
.p-code {
    color: #d63200;
    padding: 3px 5px;
    margin: 0 2px;
    border-radius: 2px;
    white-space: nowrap;
    font-size: 0.85em;
    background-color: #f8f8f8;
}
.title-2 {
    color: #273849;
    font-weight: 500;
    font-size: 1.17em;
    padding: 40px 0 30px 0;
}
.codeDiv {
    background-color: #f8f8f8;
    overflow-x: auto;
    color: #525252;
    padding: 1.2em 1.4em;
    display: block;
}

.cod {
    padding: 3px 0;
}
.code-green {
    color: green;
}
.code-red {
    color: red;
}
.code-black {
    color:black;;
}
.code-blue {
    color:blue;;
}

.code-h1 {
    padding-left: 5px;
}

.code-h2 {
    padding-left: 20px;
}

.code-h3 {
    padding-left: 35px;
}

.code-h4 {
    padding-left: 50px;
}

[v-clock] {
    display: none;
}
#bodys {
    display: none;
}
.learnLeft {
    position: fixed;
    top: 92px;
    bottom: 0;
    left: 0;
    overflow-y: auto;
    width: 250px;
    z-index: 9999;
}
.learnRight {
    /* margin: 0 0 0 210px; */
    position: relative;
    /* padding: 2.2em 0; */
    max-width: 700px;
    /*margin: 0 auto;*/
    margin-left:400px;
    top: 85px;
    Font-size:16px;
}
.righttitle {
    color: #273849;
    font-size: 22px;
    font-weight: 600;
    padding: 10px 0;
}
.righttitle2 {
    color: #273849;
    font-size: 18px;
    font-weight: 400;
    padding: 5px 0;
}
.right-p {
    font-size: 16px;
    padding: 0 0 20px 0;
}
.footer {
    position: relative;
    width: 100%;
    bottom: 0;
    margin-top: 140px;
    /* z-index: 9999; */
}
.navbar-default {
    position: fixed;
    width: 100%
}
.code {
    background-color: #f8f8f8;
    line-height: 50px;
    margin-bottom: 50px;
    text-indent: 10px;
}
.code1 {
    color: #2973b7;
}
.code2 {
    color: #42b983;
}
.code3 {
    background-color: #f8f8f8;
    margin-bottom: 50px;
    text-indent: 10px;
}
.img_p{ width:100%; object-fit:cover}
.index_img_p{padding-left:50px; width:80%; object-fit:cover}
.pad_div{ padding-left:220px;}

.list_style {
    padding-left: 17px;
}
.list_style li {
    list-style:decimal;
}