* {
    padding: 0;
    margin: 0;
}
/*
html, body {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    /*横轴居中*/
    align-items: center;
    /*纵轴居中*/
}

header {
    font-size: 35px;
    font-weight: bold;
    margin-bottom: 35px;
    color: #e52d67;
}

#app {
    width:1002px;
    display: flex;
    justify-content: space-between;
    position: relative;
}

.box {
    width:230.5px;
    overflow: hidden;
    background: #f6f6f6;
    box-sizing: border-box;
    padding: 0 10px 25px 10px;
}

.box a {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #535353;
    text-decoration: none;
}

.box a:hover {
    color: #0771c2;
}

.imgBox {
    width:230.5px;
    height: 186.67px;
    overflow: hidden;
}

.imgBox img {
    width: 100%;
    height: 100%;
    transition: all 0.6s linear;
}

.source {
    border: 1px solid #535353;
    padding: 6px 20px;
    border-radius: 25px;
    margin: 20px;
    font-size:18px;
    font-weight:700; 
}

.title {
    margin-bottom: 20px;
    font-size: 20px;
}

.detail {
    font-size: 14px;
    line-height: 160%;
    text-align: justify;
    width: 100%;
}

/*鼠标hover效果*/

.box>a::after {
    content: '';
    width:230.5px;
    position: absolute;
    background: #0771c2;
    bottom: 0;
    height: 0px;
    transition: height 0.3s linear;
    /*利用伪类高度，实现动画效果*/
}

.box>a:hover::after {
    height: 10px;
}

.box:hover img {
    transform: scale(1.15);
}

.box:hover .source {
    background: #0771c2;
    border-color: #0771c2;
    color: #ffffff;
}