main {
    position: relative;
    padding-top: 100px;
    background-color: white;
    margin-bottom: 100px;
}

.Heads {
    overflow: hidden;
    position: relative;
    width: 100%;
    height: 0;
    padding-top: 20%;
}

.Heads img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.Heads::before {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50px;
    z-index: 2;
    content: '';
    background-image: url('../img/Head-Bj/z.png');
}



.course_container {
    width: 100%;
}
.course_image {
    width: 100%;
    position: relative;
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
    overflow: hidden;
    margin-bottom: 21px; 
    border: 1px solid #dddddd; 
    height: 0;
    padding-top: 60%;
}
.course_image img { 

    position: absolute;
    height: 90% !important;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}
.course_tabs_container {
    width: 100%;
    margin-top: 30px;
}
.tab.active, .tab:hover {
    background: #FF7100;
    color: #FFFFFF;
}
.tab {
    height: 40px;
    background: #f2f4f5;
    font-size: 16px;
    color: #1b1f2e;
    font-weight: 500;
    line-height: 40px;
    text-align: center;
    text-transform: uppercase;
    cursor: pointer;
    margin-right: 10px;
    padding-left: 21px;
    padding-right: 20px;
    -webkit-transition: all 200ms ease;
    -moz-transition: all 200ms ease;
    -ms-transition: all 200ms ease;
    -o-transition: all 200ms ease;
    transition: all 200ms ease;
}
.tab_panel { 
    width: 100%;
    height: 100%;
    -webkit-animation: fadeEffect 1s;
    animation: fadeEffect 1s;
    border: solid 1px #ebebeb;
    padding-left: 30px;
    padding-right: 30px;
    padding-top: 30px;
    padding-bottom: 25px;
}.tab_panel_text p {
    font-size: 16px;
    font-weight: 400;
    color: #76777a;
    line-height: 1.75;
}b, strong {
    font-weight: bolder;
    color: black;
} 
.tab_panel_text table  {
    border-collapse: collapse;
    border-style: hidden;
    width: 100%;
    border: 1px solid #ddd;
  }
  
  .tab_panel_text table  td,
  .tab_panel_text table th {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
    word-wrap: break-word;    /* 旧版浏览器 */
    overflow-wrap: break-word; /* 新版标准 */
    word-break: break-all;    
    width: 25%;
  }


.contact_form {
    padding-right: 10px;
}

.contact_info_title {
    font-family: 'Poppins', sans-serif;
    font-size: 36px;
    font-weight: 700;
    color: #1b1f2e;
}.comment_form {
    margin-top: 35px;
}.comment_form > div:not(:last-child) {
    margin-bottom: 25px;
}.form_title {
    font-size: 16px;
    font-weight: 400;
    color: #1b1f2e;
    margin-bottom: 12px;
}.comment_input {
    width: 100%;
    height: 46px;
    border: solid 1px #d9d9d9;
    border-radius: 3px;
    padding-left: 19px;
    font-size: 16px;
    font-weight: 400;
    color: #2c3145;
}.comment_textarea {
    width: 100%;
    height: 150px;
    padding-top: 15px;
}.comment_button {
    width: 100%;
    height: 46px;
    background: #FF7100;
    text-transform: uppercase;
    font-size: 14px;
    font-weight: 500;
    color: #FFFFFF;
    cursor: pointer;
    border: none;
    outline: none;
    border-radius: 50px;
    margin-top: 15px;
}.comment_input:focus {
    border: solid 1px #FF7100;
    outline: none;
}


@media screen and (max-width:991px) {
    .sidebar{
        margin-top: 50px;
    }
}