<style>
* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

/* Style the header */
.header {
  background-color: #f1f1f1;
  padding: 1px;
  text-align: center;
}

/* Style the top navigation bar */
.topnav {
  overflow: hidden;
  background-color: green;
}

/* Style the topnav links */
.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

/* Change color on hover */
.topnav a:hover {
  background-color: #ddd;
  color: black;
}

/* Create three unequal columns that floats next to each other */
.column {
  float: left;
  padding: 10px;
}

/* Left and right column */
.column.side {
  width: 7%;
}

/* Middle column */
.column.middle {
  width: 82%;
  border-style: solid;
  overflow: auto;
}

textarea {
 width: 300px;
 height: 100px;
 background-color: yellow;
 font-size: 20px;
 font-weight: bold;
 font-family: Verdana, Arial, Helvetica, sans-serif;
 border: 1px solid black;
}

.footer {
  background-color: #F1F1F1;
  text-align: center;
  padding: 20px;
}

div { text-align: center; }
div > div { display: inline-block }
textarea {  resize: none;border : 2px solid

/* Responsive layout - makes the three columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
  .column.side, .column.middle {
    width: 100%;
  }
}

</style>