html, body {
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    word-wrap: break-word;
    word-break: break-all;
    font: 24px / 1 arial, "Microsoft Yahei", "Hiragino Sans GB", sans-serif;
    color: #000;
    background: #fff;
}

html, body, ul, li, a {
    margin: 0;
    padding: 0;
    list-style: none;
}

a {
    text-decoration: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

header {
    width: 100%;
    height: 100px;
    position: fixed;
    top: 0;
    z-index: 999;
    font: 30px / 1.0 arial;
    display: flex;
    background: #8eba8e;

}

header .logo {
    height: 100%;
    flex-grow: 2;

}

header .logo div {
    display: flex;
    flex-direction: column;
}

header .logo span {
    margin: auto;
}

header .nav {
    flex-grow: 1;
}

header .nav ul {
    height: 100%;
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 0;
    margin: 0;
}

main {
    width: 90%;
    margin: 0 auto;
}

header .nav ul li {
    margin-left: 150px;
}

.home {
    padding-top: 100px;
    width: 100%;
    height: 100%;
    box-shadow: 0 0 30px 5px black;
}

.home img {
    width: 100%;
    height: 100%;
}
.about {
    margin-top: 40px;
}

.about .title {
    background: linear-gradient(to right, aqua 0%, #beecec 100%);
    margin-right: 20px;
    font: 30px / 1.0 arial;
}

.about::before {
    content: "";
    display: block;
    height: 100px; /* 偏移的高度 */
    margin-top: -100px; /* 向上移动相同的高度，以抵消伪元素的高度 */
}

.about p {
    line-height: 40px;
}

.products {
    margin: 20px auto 30px;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
}

.products > div > img {
    width: 80%;
    height: 80%;
    transition: transform 0.3s ease;
}

.products > div:hover img {
    transform: scale(1.1);
}

.ph {
    margin-top: 100px;
}

.ph span {
    background: linear-gradient(to right, aqua 0%, #beecec 100%);
    font: 36px / 1.0 arial;
}

.ph::before {
    content: "";
    display: block;
    height: 100px; /* 偏移的高度 */
    margin-top: -140px; /* 向上移动相同的高度，以抵消伪元素的高度 */
}


.footer {
    background: #8eba8e;
}

.contact_us {
    padding: 10px 60px;
    width: 50%;
    margin: auto;
}