div.container4 {
  height: 10em;
  display: flex;
  align-items: center;
  justify-content: center }
div.container4 p {
  margin: 0 }
  
.banner {
    background-color: #e9e9e9; 
    padding: 20px; 
}

.topnav {
  overflow: hidden;
  background-color: #e9e9e9;
}

.topnav a {
  float: left;
  display: block;
  color: black;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav active {
  background-color: #2196F3;
  color: white;
}


.topnav input[type=text] {
  float: right;
  padding: 6px;
  border: none;
  margin-top: 8px;
  margin-right: 16px;
  font-size: 17px;
}

.img-with-text {
    text-align: center;
    width: 100%;
}

.image {
    display: inline-block;
    border:1px solid black;
}

@media screen and (max-width: 500px) {
  .topnav a, .topnav input[type=text] {
    float: none;
    display: block;
    text-align: left;
    width: 100%;
    margin: 0;
    padding: 14px;
  }
  .topnav input[type=text] {
    border: 1px solid #ccc;
  }
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

.container {
  align-items: center; 
  float: left;
}

/*.image {
    display: block;
    margin: 0 auto;
}*/

.button{
 display:block;
 padding-top:5px;
 width:100%;
 height:25px;
 background-color:white;
 border-radius:4px;
 border:3px solid blue;
}

a.button,a:visited.button{
  color:blue;
  text-decoration:none;
}

a:hover.button,a:active.button{
  color:white;
  background-color:blue;
}