body {
  font-family: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box; 
}

a {
  color: green;
}

.row {
  display: flex;
  margin-left: -5px;
  margin-right: -5px;
}

.column {
  flex: 50%;
  padding: 5px;
  width: 50%;
  float: left;
}

/* Clearfix (clear floats) */
.row::after {
  content: "";
  clear: both;
  display: table; /* https://www.w3schools.com/howto/howto_css_table_side_by_side.asp */
}

table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
  border: 1px solid #ddd;     
}

th, td {
  text-align: left;
  padding: 16px;
}

tr:nth-child(even) {
  background-color: #f2f2f2;
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other on screens that are smaller than 600 px */
@media screen and (max-width: 600px) {
  .column {
    width: 100%;
  }
}

.flex-container {
    display: flex;
}

.flex-child {
    flex: 1;
    border: none;
    margin-right: 20px;
}