main.css

* {
    box-sizing: border-box;
}

body {
  margin: 0;
}

/* Style the top navigation bar */
.topnav {
    overflow: hidden;
    background-color: #333;
}

/* Style the topnav links */
.topnav a {
    float: left;
    width: 50%;
    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: 25%;
}

/* Middle column */
.column.middle {
    width: 50%;
}

/* Clear floats after the columns */
.row:after {
    content: "";
    display: table;
    clear: both;
}

.paragraph {
    padding-left: 10px;
    width: 30%;
    flex: 1 1 auto;
}

.additional {
    width: 30%;
    padding-left: 30px;
}

.addbutton {
   padding-left: 10px;
   width: 10%;
}

.search {
  width: 100%;
  padding-left: 10px;
  display: flex;
  flex-flow: row nowrap;
}