* {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

header {
  background: #333;
  color: #fff;
  padding: 20px;
}

.logo {
  width: 50px;
  height: 50px;
}

nav {
  float: right;
}

nav ul {
  list-style: none; 
}

nav li {
  display: inline-block;
}

nav a {
  color: #fff;
  text-decoration: none;
  padding: 0 10px;
}

.banner {
  padding: 0;
/*   background: url(banner.jpg) no-repeat center center;
  background-size: cover;
  text-align: center;
  color: #fff; */
}

.banner img {
  width: 100%;
  vertical-align: bottom;
}

section {
  padding: 50px 0;
} 

.about p, 
.product p,
.case p {
  width: 80%;
  margin: 0 auto;
  padding-bottom: 20px;
}

.product .item {
  float: left;
  width: 33.3%;
  padding: 0 10px;
}

.product img {
  width: 70%;
  display: block;
  margin: 0 auto;
}

.case .item {
  width: 48%;
  float: left;
}

.case img {
  width: 100%;
}   

.contact p {
  width: 60%;
  margin: 0 auto 20px; 
}  

footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 20px 0;
}