body {
  margin: 0
}

ul {
    position: sticky;
    top: 0;
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333333;
}

ul li {
    margin: auto;
    float: left;
    align-items: center;
}

ul li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

ul li a:hover {
    background-color: #111111;
}

.style {
    display: flex;
    justify-content: center;
}

.box {
  display: grid;       /* Aligns children side-by-side */
  grid-template-columns: 3fr 11fr 3fr;           /* Adds space between columns */
  gap: 20px;
  overflow-wrap: break-word;
  word-break: normal;
}

.column1 {
  flex: 1;             /* Forces all three columns to have equal width */
  padding: 15px;
  background-color: #3fda3f;
  border-right: 2px solid #000000;
  min-height: 100vh;
  margin-left: 0;
}
.column2 {
  flex: 1;             /* Forces all three columns to have equal width */
  padding: 15px;
  background-color: #FFFFFF;
}
.column3 {
  flex: 1;             /* Forces all three columns to have equal width */
  padding: 15px;
  border-left: 2px solid #000000;
  background-color: #3fda3f;
  min-height: 100vh;
}