* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-size: 16px;
  color: #333;
  background-color: #fff;
}

img {
  max-width: 100%;
  object-fit: contain;
}

a {
  color: #333;
  text-decoration: none;
}

ul,
li {
  list-style: none;
}
.bx {
  width: 1200px;
  margin: 0 auto;
}
header {
  background-color: #ffffff8f;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  z-index: 100;
}
header > div {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header > div > .logo {
  height: calc(100% - 20px);
}
header > div > .logo > img {
  height: 100%;
}
header > div > nav > ul {
  display: flex;
}
header > div > nav > ul > li {
  margin-left: 40px;
}
header > div > nav > ul > li > a {
  /* color: #fff; */
}
.banner {
  position: relative;
}
.banner > .img {
  font-size: 0;
  position: relative;
}
.banner > .img::after {
  content: "";
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
  z-index: 1;
}
.banner > .text {
  color: #fff;
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  transform: translate(-50%, 100%);
  opacity: 0;
  animation: banner1 2s ease-in-out forwards;
}
.banner > .text > h1 {
  font-size: 60px;
  white-space: nowrap;
}
@keyframes banner1 {
  to {
    transform: translate(-50%, -50%);
    opacity: 1;
  }
}
main {
  /* padding-bottom: 40px; */
}
.content {
  padding: 40px 0;
}
.content > .bx > .title {
  text-align: center;
  margin-bottom: 20px;
}
.content > .bx > .title > h2 {
  margin-bottom: 10px;
}
.content > .bx > .text {
  display: flex;
  align-items: center;
}
.content > .bx > .text > .img {
  flex-shrink: 0;
  margin-right: 50px;
  width: 250px;
  height: 250px;
}
.content p {
  line-height: 2;
  text-indent: 2em;
}
.content p span {
  font-weight: bold;
}
footer {
  background-color: #333;
  color: #fff;
  padding: 20px 0;
  text-align: center;
  font-size: 14px;
}
footer p {
  line-height: 2;
}
footer a {
  color: #fff;
}
#us {
  background-color: #f4f4f4;
}