#banner {
  display: flex;
  justify-content: center;
  top: 50px;
}
header {background-color: #0004BD;
        color: white;
        border-radius: 5px 5px 0px 0px;
        height: 30px;
        max-width:1020px;
        margin: auto;}
        
.box {  background-color:#a0a0a4;
        border: 2px solid;
        border-color: #ffffff #808080 #808080 #ffffff;
        padding: 10px;
        max-width: 1000px;
        margin: 50px auto;}