calendar.css

div,ul,li {
    margin: 0;
    padding: 0;
}

ul,li {
    list-style: none;
}

a {
    text-decoration: none;
    color: #000;
}

.calendar {
    width: 100%;
}

.calendar-header {
    width: 100%;
    text-align: center;
    padding: 13px 0;
    line-height: 14px;
    border-bottom: 1px solid #ddd;
}

.calendar-header>i{
    display: inline-block;
    width: 14px;
    height: 14px;
    vertical-align: -2px;
    position: relative;
}

.calendar-header>span {
    margin: 0 5%;
}

.calendar-header>.icon-left:before,
.calendar-header>.icon-left:after,
.calendar-header>.icon-right:before,
.calendar-header>.icon-right:after
{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
}

.calendar-header>.icon-left:before {
    border: 7px solid red;
    border-color: transparent #666 transparent transparent;
    -webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
    -o-transform: translateX(-50%);
    transform: translateX(-50%);
}

.calendar-header>.icon-left:after {
    border: 7px solid #fff;
    border-color: transparent #fff transparent transparent;
    -webkit-transform: translateX(-40%);
    -moz-transform: translateX(-40%);
    -ms-transform: translateX(-40%);
    -o-transform: translateX(-40%);
    transform: translateX(-40%);
}

.calendar-header>.icon-right:before {
    border: 7px solid red;
    border-color: transparent transparent transparent #666;
    -webkit-transform: translateX(50%);
    -moz-transform: translateX(50%);
    -ms-transform: translateX(50%);
    -o-transform: translateX(50%);
    transform: translateX(50%);
}

.calendar-header>.icon-right:after {
    border: 7px solid #fff;
    border-color: transparent transparent transparent #fff;
    -webkit-transform: translateX(40%);
    -moz-transform: translateX(40%);
    -ms-transform: translateX(40%);
    -o-transform: translateX(40%);
    transform: translateX(40%);
}

.calendar-body>.c-body-head {
    width: 100%;
    display: flex;
}

.calendar-body>.c-body-head>li {
    flex : 1;
    text-align: center;
    padding: 10px 0;
}

.calendar-body>.c-body-content {
    width: 100%;
}

.calendar-body>.c-body-content>ul {
    display: flex;
}

.calendar-body>.c-body-content>ul>li {
    flex: 1;
    text-align: center;
    padding: 5px 0;
}

.content-row>.item-gray>a {
    color: #ccc;
}

.content-row>.item-tag>a {
    position: relative;
}

.content-row>.item-tag>a:after{
    content: '';
    width: 8px;
    height: 8px;
    position: absolute;
    bottom: -3px;
    left: 50%;
    -webkit-transform: translate3D(-50%, 70%, 0);
    -moz-transform: translate3D(-50%, 70%, 0);
    -ms-transform: translate3D(-50%, 70%, 0);
    -o-transform: translate3D(-50%, 70%, 0);
    transform: translate3D(-50%, 70%, 0);
    background-color: #b0ceee;
    border-radius: 50%;
}

.content-row>li>a {
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    display: inline-block;
}

.content-row>.item-current, .content-row>.item-active {
    text-align: center;
}
.content-row>.item-current>a {
    background-color: #1a85ff;
    color: #fff;
    border-radius: 50%;
}

.content-row>.item-active>a {
    background-color: #31a0c6;
    color: #fff;
    border-radius: 50%;
}