body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, button, textarea, p, blockquote, th, td {
    margin: 0;
    padding: 0;
}

ul, ol {
    list-style: none;
}

a {
    text-decoration: none;
}

.songimg {
    width: 320px;
    height: 200px;

    background: #f5f5f5;
    margin: 0 auto;
}

.songimg img {
    width: 100%;
    height: 100%;
    max-height: 100%;
    max-width: 100%;
    object-fit: cover; /*加上这个就可以实现需求效果*/
}

em,
i {
    font-style: normal;
}

html,
body {
    width: 100%;
    min-width: 1240px;
}

body {
    background-image: linear-gradient(120deg, #ec74e4, #c1e623);
    font-family: Helvetica;
    font-size: 16px;
}

div.site {
    overflow: hidden;
    margin: 10px;
}

div.wrapper {
    position: relative;
    width: 75rem;
}

div.wrapper.demo1 {
    margin: 60px auto 0 auto;
}

div.wrapper:not(.demo1) {
    margin: 80px auto 0 auto;
}

div.wrapper > h3 {
    display: inline-block;
    padding: 0 1rem;
    margin-bottom: 2rem;
    border-radius: 1.4rem;
    background-color: #fff;
    font-size: 1.4rem;
    font-weight: 400;
    color: #222;
}

div.wrapper > ul.container {
    position: relative;
    height: 25rem;
    margin: 0 auto;
    transform: translate3d(0, 0, 0);
}

div.wrapper ul.container > li.cards_list {
    border-radius: 0.3125rem;
    background-color: #f4f4f4;
    overflow: hidden;
}

ul.container > li.cards_list > div.img > img {
    display: block;
    width: 20rem;
}

ul.container > li.cards_list > div.main_con {
    padding: 0 1rem;
    box-sizing: border-box;
}

ul.container > li.cards_list > div.main_con h4.name {
    padding-top: 1rem;
    font-size: 1.2rem;
    font-weight: 600;
    color: #424242;
}

ul.container > li.cards_list > div.main_con p.content {
    padding-top: 1rem;
    height: 4.5rem;
    font-size: 0.9rem;
    color: #777;
    text-align: justify;
    line-height: 1.5rem;
}

ul.container > li.cards_list > div.main_con p.label {
    font-size: 0.9rem;
    color: #555;
    padding-top: 1rem;
    padding-bottom: 2rem;
}

div.wrapper.horizontal > ul.container {
    width: 75rem;
}

div.wrapper.vertical > ul.container {
    width: 40rem;
}

div.wrapper.horizontal ul.container > li.cards_list {
    width: 20rem;
}

div.wrapper.vertical ul.container > li.cards_list {
    display: flex;
}

i.btn-direct {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 3.6rem;
    height: 3.6rem;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, .7);
    opacity: 0;
    cursor: pointer;
    z-index: 100;
    transition: opacity ease 300ms;
}

div.wrapper:hover i.btn-direct {
    opacity: .6;
}

i.btn-direct:hover {
    opacity: .9 !important;
}

i.btn-direct.btn-left {
    left: 3rem;
}

i.btn-direct.btn-right {
    right: 3rem;
}

i.btn-direct > span {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1.2rem;
    height: 1.2rem;
    border-top: 0.125rem solid #fff;
    border-left: 0.125rem solid #fff;
}

div.wrapper.horizontal i.btn-direct > span.shift-left {
    transform: translate(-30%, -50%) rotate(-45deg);
}

div.wrapper.horizontal i.btn-direct > span.shift-right {
    transform: translate(-70%, -50%) rotate(135deg);
}

div.wrapper.vertical i.btn-direct > span.shift-left {
    transform: translate(-50%, -30%) rotate(45deg);
}

div.wrapper.vertical i.btn-direct > span.shift-right {
    transform: translate(-50%, -70%) rotate(-135deg);
}
.panel {
    position: relative;
    margin-bottom: 25px;
    border-radius: 4px;
    border: 0;
    box-shadow: none;
}
.panel.panelMove .panel-heading {
    cursor: move;
}
.panel-primary > .panel-heading {
    color: #ffffff;
    background-color: #75b9e6;
    border-color: #75b9e6;
}
.panel-primary > .panel-heading {
    color: #ffffff;
    background-color: #75b9e6;
    border-color: #75b9e6;
}
.panel-heading {
    padding: 0 15px;
    min-height: 4px;
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
}
.panel-heading {
    padding: 10px 15px;
    border-bottom: 1px solid transparent;
    border-bottom-color: transparent;
    border-top-right-radius: 3px;
    border-top-left-radius: 3px;
}

.panel-heading .panel-title {
    font-size: 14px;
    font-weight: normal;
    float: left;
    margin-right: 10px;
    padding: 12px 0;
    min-height: 42px;
}
.panel-title {
    margin-top: 0;
    margin-bottom: 0;
    font-size: 16px;
    color: inherit;
}
.panel-primary div.panel-body:last-of-type {
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
}
.panel-primary > .panel-body {
    border: 1px solid #75b9e6;
    border-top-color: rgb(117, 185, 230);
    border-top-style: solid;
    border-top-width: 1px;
    border-top: none;
}
.panel-body {
    padding: 15px;
}