h1, h2, h3 {
  font-weight: 700;
}

img {
  max-width: 100%;
  height: auto;
}

@media screen and (min-width: 600px) {
  .header-grid {
    display: grid;
  }
}

.jumbotron {
  background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.5)), url("https://coworking-thun.ch/images/coworking-thun_meetup.jpg") no-repeat;
  background-size: cover;
  color: white;
  padding: 15vh 0;
  margin-bottom: 0;
}

.feature h2 {
  text-align: center;
}

.container-popup {
  background: darkslateblue;
  color: white;
}