header {
  background: url('https://www.thoughtco.com/thmb/3NKfAc1GQJYM6CjMyvlZED3VE10=/1500x1125/filters:fill(auto,1)/3-D_DNA-56a09ae45f9b58eba4b20266.jpg') no-repeat fixed center / cover;
  padding: 30px;
}

nav ul {
  list-style: none;
  font-size: 0;
}

nav li {
  margin-bottom: 0;
  display: inline-block;
  width: 50%;
}

nav a {
  position: relative;
  width: 100%;
  height: 20px;
  padding: 7px;
  line_height: 20px; 
}

nav li:nth-child(2n+1) a:after {
  position: absolute;
  content: '';
  top: 19.5px;
  right: -2.5px;
  z-index: 10;
  border-radius: 100%;
  background: steelblue;
  width: 5px;
  height: 5px;
}

body {
  font-family: system-ui;
  background: black;
  color: white;
  text-align: center;
}
.summary {
  background: #3c153b;
  padding: 10px;
}


/* OUr members */
/* Three columns side by side */
.column {
  float: left;
  width: 33.3%;
  margin-bottom: 16px;
  padding: 0 8px;
}

/* Display the columns below each other instead of side by side on small screens */
@media screen and (max-width: 650px) {
  .column {
    width: 100%;
    display: block;
  }
}

/* Add some shadows to create a card effect */
.card {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

/* Some left and right padding inside the container */
.container {
  padding: 0 16px;
}

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

.title {
  color: grey;
}

.button {
  border: none;
  outline: 0;
  display: inline-block;
  padding: 8px;
  color: white;
  background-color: #000;
  text-align: center;
  cursor: pointer;
  width: 100%;
}

.button:hover {
  background-color: #555;
}