.about-history {
    font-size: 16px;
    color: #666;
    line-height: 36px;
}

.about-history ul {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

.about-history ul li {
    width: 25%;
    background: #fff;
    height: 260px;
    border-right: 1px solid #9c9c9c;
    border-top: 1px solid #9c9c9c;
    border-bottom: 1px solid #9c9c9c;
    text-align: center;
    padding-top: 80px;
    box-shadow: 0 4px 4px rgba(0, 0, 0, 0.3);
    z-index: 0;
}

.about-history ul li:hover,.about-history ul li.on {
    background: #008be0;
    color: #fff;
    width: 35%;
    height: 270px;
    box-shadow: 6px 4px 4px rgba(0, 0, 0, 0.3);
    z-index: 9;
    padding-top: 90px;
}

.about-history ul li:last-child {
    border-right: 1px solid #9c9c9c;
}

.about-history ul li h2 {
    text-align: center;
	font-weight: 500;
	font-size: 26px;
	margin-bottom: 40px;
}

.about-history ul li:first-child {
    border-left: 1px solid #9c9c9c;
}

.about-history ul li em {
    display: inline-block;
    font-size: 24px;
    font-weight: 600;
}

.about-history ul li p {
    width: 80%;
    font-size: 14px;
    line-height: 30px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}
@media only screen and (max-width: 768px){
	.about-history ul {
		flex-direction: column;
		width: 92%;
		margin-left: 4%;
		margin-right: 4%;
	}
	.about-history ul li:hover, .about-history ul li.on {
		width: 100%;
	}
	.about-history ul li {
		width: 100%;
	}
	.about-history{
		padding-bottom: 50px;
	}
	
}