body, html {
    width: 100%;
    height: 100%;
    margin: 0;
    font: 16px/1.5 "Lucida Grande", "Microsoft JhengHei", "Microsoft YaHei";
    color: #333;
}

.btn {
    display: inline-block;
    padding: .5em 1em;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    white-space: nowrap;
    vertical-align: middle;
    -ms-touch-action: manipulation;
    touch-action: manipulation;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-image: none;
    border: 1px solid transparent;
    border-radius: .16667rem;
    -webkit-transition: background-color .3s ease-out, border-color .3s ease-out;
    -moz-transition: background-color .3s ease-out, border-color .3s ease-out;
    transition: background-color .3s ease-out, border-color .3s ease-out
}

.btn-primary {
    color: #fff;
    border-color: #0e90d2;
    background-color: #0e90d2
}

.btn-primary:hover {
    border-color: #0c79b1;
    background-color: #0c79b1
}

.btn-primary.active, .btn-primary:active {
    border-color: #0a628f;
    background-color: #0a628f
}

.btn-secondary {
    color: #fff;
    border-color: #3bb4f2;
    background-color: #3bb4f2
}

.btn-secondary:hover {
    border-color: #19a7f0;
    background-color: #19a7f0
}

.btn-secondary.active, .btn-secondary:active {
    border-color: #0e93d7;
    background-color: #0e93d7
}

.btn-success {
    color: #fff;
    border-color: #5eb95e;
    background-color: #5eb95e
}

.btn-success:hover {
    border-color: #4aaa4a;
    background-color: #4aaa4a
}

.btn-success.active, .btn-success:active {
    border-color: #3f913f;
    background-color: #3f913f
}

.btn-danger {
    color: #fff;
    border-color: #dd514c;
    background-color: #dd514c
}

.btn-danger:hover {
    border-color: #d7342e;
    background-color: #d7342e
}

.btn-danger.active, .btn-danger:active {
    border-color: #be2924;
    background-color: #be2924
}

.btn-default {
    border-color: #ccc;
    background-color: #fff
}

.btn-default:hover {
    background-color: #e6e6e6
}

.btn-default.active, .btn-default:active {
    border-color: #999;
    background-color: #d4d4d4;
    position: relative;
    top: 2
}

.btn-sm {
    padding: .2em .6em
}

.btn-lg {
    padding: .8em 1.7em
}

.btn-block {
    display: block;
    width: 100%
}

.btn-group {
    display: inline-block
}

.btn-group > .btn {
    float: left;
    border-radius: 0
}

.btn-group > .btn:not(:first-child) {
    margin-left: -1px
}

.btn-group > .btn:first-child {
    border-top-left-radius: .16667rem;
    border-bottom-left-radius: .16667rem
}

.btn-group > .btn.dropdown-toggle, .btn-group > .btn:last-child {
    border-top-right-radius: .16667rem;
    border-bottom-right-radius: .16667rem
}

.btn-group:after {
    content: "";
    display: block;
    clear: both
}

.btn-group-vertical {
    display: inline-block
}

.btn-group-vertical > .btn {
    display: block;
    width: 100%;
    border-radius: 0
}

.btn-group-vertical > .btn:not(:first-child) {
    margin-top: -1px
}

.btn-group-vertical > .btn:first-child {
    border-top-left-radius: .16667rem;
    border-top-right-radius: .16667rem
}

.btn-group-vertical > .btn:last-child {
    border-bottom-left-radius: .16667rem;
    border-bottom-right-radius: .16667rem
}

/* 实例样式 */
[id^="instance"] {
    text-align: center;
}
.demo {
    width: 70%;
    height: 600px;
    margin: 50px auto;
    border: 1px solid #ccc;
}
.btn{
    margin: 0 5px;
    font-size: 20px;
}