main{
    width: 80%;
    margin:20px auto;
    overflow: hidden;
    background-color: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius:10px;
    padding-top:30px;
}

h2{
    font-size:30px;
    color:#4fba54;
    text-align:center;
    margin-bottom:20px;
}
span:not(.slogn){
    display:inline-block;
    text-indent:2em;
    font-size:18px;
    line-height:25px;
    margin:20px 20px;
}
h3{
    font-size:25px;
    text-indent:2em;
    line-height:35px;
}
.tech-block {
    display: flex;
    align-items: center;
    margin-bottom: 40px;
    margin-left:20px;
    margin-right:20px;
    box-shadow: 1px 1px 4px 3px #45a049;
    height:280px;
}

.tech-block img {
    width:400px; 
    height: 260px;
    object-fit:contain;
    border-radius: 8px;
}

.tech-block .tech-description {
    width: 60%; 
}

.tech-block1 {
    margin-bottom: 40px;
    margin-left:20px;
    margin-right:20px;
    box-shadow: 1px 1px 4px 3px #45a049;
    height:320px;
}
.tech-block1 img {
    width:400px; 
    height: 300px;
    object-fit:contain;
    border-radius: 8px;
    margin-right: 20px; 
}
.flex{

    display:flex;
    vertical-align: middle;
}
.hh3{
    display:inline-block;
    margin-top:30px;
}
.flex img{
    position:relative;
    bottom:50px;
}
.flex span{
    position:relative;
    top:30px;
}
@media (max-width: 768px) {
    .tech-block {
        flex-direction: column;
    }

    .tech-block img {
        width: 100%; 
        margin-bottom: 20px;
        margin-right: 0;
    }

    .tech-block .tech-description {
        width: 100%;
    }
}
section{
    margin-top:20px;
}

/* 底部 */
#footer{
    padding: 25px;
    text-align: center;
    font-size: 14px;
    background-color: rgba(0, 0, 0, 0.2);
    line-height: 2;
}