.clear {
    clear: both;
}
.timeline-box {
    background: #fff;
    padding: 8px;
    position: relative;
    min-height: 90vh;
    margin-top:20px;
}
.timeline-main {
    position: relative;
    min-height: 85vh;
}

    .timeline-main > h1 {
        font-size: 18px;
        background: #fff;
        z-index: 1;
        position: relative;
        color: #484348;
        margin-left: 33%; /*写给不支持 calc()的浏览器*/
        margin-left: -moz-calc(35% - 7px);
        margin-left: -webkit-calc(35% - 7px);
        margin-left: calc(35% - 7px);
    }

        .timeline-main > h1 > i {
            padding-right: 10px;
            font-size: 20px;
        }

        .timeline-main > h1 > span {
            display: none;
        }

    .timeline-main h2,
    .timeline-main h3 {
        width: 31%;
        text-align: right;
    }

        .timeline-main h2,
        .timeline-main h2 > a {
            font-size: 16px;
            margin: 5px 0;
            color: #6bc30d;
        }

        .timeline-main h3,
        .timeline-main h3 > a {
            font-size: 14px;
            margin: 2px 0;
            color: #FF5722;
        }

.timeline-month > ul > li {
    padding: 10px 0;
}

    .timeline-month > ul > li .h4 {
        display: inline-block;
        width: 31%;
        text-align: right;
        float: left;
    }

.date {
    display: inline-block;
    padding: 2px 5px;
    color: #484348;
    font-size: 15px;
    margin-top:5px;
}

.dot-circle {
    color: #009688;
    width: 8%;
    text-align: center;
    font-size: 22px;
    z-index: 1;
    position: relative;
    background: #fff;
    float: left;
}

.content {
    max-width: 50%;
    float: left;
    padding: 10px;
    margin-left: 10px;
    position: relative;
    z-index: 1;
    background: #009688;
    color: #fff;
}
    .content img{width:100%}
    .content::before {
        position: absolute;
        left: -20px;
        top: 6px;
        height: 0;
        width: 0;
        content: '';
        border: 10px solid rgba(255, 255, 255, 0.00);
        border-top: 6px solid rgba(255, 255, 255, 0.00);
        border-bottom: 6px solid rgba(255, 255, 255, 0.00);
        border-right-color: #009688;
    }

.timeline-line {
    position: absolute;
    left: 35%;
    top: 0;
    height: 100%;
    width: 2px;
    background: #009688;
    z-index: 0;
}

.timeline-year {
    margin: 10px 0;
}



/* 小屏幕（平板，大于等于 768px） */
@media (min-width: 768px) {
    .timeline-box {
        background: #fff;
        padding: 15px;
        position: relative;
        min-height: 90vh;
    }

    .timeline-main > h1 {
        font-size: 26px;
        margin-left: 16%; /*写给不支持calc()的浏览器*/
        margin-left: -moz-calc(18% - 13px);
        margin-left: -webkit-calc(18% - 13px);
        margin-left: calc(18% -13px);
    }

        .timeline-main > h1 > i {
            font-size: 30px;
        }

        .timeline-main > h1 > span {
            display: inline;
        }

    .timeline-main h2,
    .timeline-main h3 {
        width: 16%;
    }

        .timeline-main h2,
        .timeline-main h2 > a {
            font-size: 24px;
        }

        .timeline-main h3,
        .timeline-main h3 > a {
            font-size: 20px;
        }

    .timeline-month > ul > li .h4 {
        width: 16%;
    }

    .dot-circle {
        width: 4%;
        font-size: 22px;
    }

    .content {
        max-width: 70%;
    }

    .timeline-line {
        left: 18%;
    }
}

/* 中等屏幕（桌面显示器，大于等于 992px） */
@media (min-width: 992px) {
    .timeline-main > h1 {
        font-size: 34px;
        background: #fff;
        z-index: 1;
        position: relative;
        color: #009688;
        margin-left: 17%; /*写给不支持calc()的浏览器*/
        margin-left: -moz-calc(18% - 16px);
        margin-left: -webkit-calc(18% - 16px);
        margin-left: calc(18% - 16px);
    }

        .timeline-main > h1 > i {
            font-size: 36px;
        }

    .timeline-main h2,
    .timeline-main h2 > a {
        font-size: 30px;
    }

    .timeline-main h3,
    .timeline-main h3 > a {
        font-size: 24px;
    }
}