.tabs {
  position: relative;   
  min-height: 400px; /* This part sucks */
  clear: both;
  margin: 10px 0;
}
.tab {
  float: left;
}
.tab label {
  background: #eee; 
  padding: 10px; 
  border: 1px solid #ccc; 
  margin-left: -1px; 
  position: relative;
  left: 1px; 
}
.tab [type=radio] {
  display: none;   
}
.content {
  position: absolute;
  max-width:500px;
  top: 28px;
  left: 0px;
  background: white;
  right: 0;
  bottom: 0;
  padding: 20px;
  border: 1px solid #ccc; 
}
[type=radio]:checked ~ label {
  background: white;
  border-bottom: 1px solid white;
  z-index: 2;
}
[type=radio]:checked ~ label ~ .content {
  z-index: 1;
}

.header {
  width:900;
  margin: auto;
  text-align: center;
  border-style: double;
  background-color: black;
}


.wrapper {
  width:900px;
  margin: auto;
}

.banner {
margin-top: -15px;
background-image: url("/images/banor.jpg");
height: 175px;
}

.nav{
 display: flex;
 flex-direction: row;
 justify-content: space-between;
 align-items: center;
 margin-left:100px;
 margin-right:100px;
}