鼠标滑过天极爱透明背景

鼠标滑动的时候添加背景，字体颜色变成白色

添加的时候总是出现模糊的颜色

鼠标滑动到外层item的时候overlay透明度变成1

.services .service-item:hover .overlay

文字p重要的是添加absolute的定位，才能显示在overlay的上面position: absolute;

.services {
    padding: 120px 0px 90px;
}

.services .service-item {
    position: relative;
    min-height: 250px;
    text-align: center;
    margin-bottom: 30px;
    background-color: #fff;
    -webkit-transition: .25s;
    transition: .25s;
}

.services .service-item .overlay {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: rgba(0, 0, 0, .6) url(../../images/pro-bg.png) no-repeat center center;
    background-size: 80%;
    opacity: 0;
    transition: .5s;
}

.services .service-item:hover .overlay {
    z-index: 1;
    opacity: 1;
}

.services .service-item p {
    padding: 30px;
    color: #000000;
    position: absolute;
    z-index: 1000;
}

.services .service-item:hover p {
    color: #ffffff;
    position: absolute;
    z-index: 1000;
    opacity: 1;
}

.services .service-item:hover {
    -moz-box-shadow: 0px 4px 16px 0px #808080;
    -webkit-box-shadow: 0px 4px 16px 0px #808080;
    box-shadow: 0px 4px 16px 0px #808080;
    -webkit-transform: translateY(-2%);
    transform: translateY(-2%);
}