style.css

body {
  margin: 0px;
  padding: 0px;
  background-color: #efefef;
  font-size: 1em;
  font-family: 'Open Sans', sans-serif;
}

h1, h2 {
  font-family: 'Roboto', sans-serif;
  columns: #3f3f38;
  font-size: 3em;
  font-weight: lighter;
  letter-spacing: 0.1em;
  margin: 10px 0;
}

h2 {
  font-size: 1.4em;
}

.btn-green {
  background-color: #b0ba43;
  padding: 0.5em;
  font-weight: bolder;
  color: white;
}

.btn-green:hover {
  background-color: #d9e837;
}

.img-circle {
  width: 150px;
  border-radius: 50%;
}

.container {
  width: 700px;
  margin: 40px auto;
}

.card {
  background-color: white;
  padding: 40px;
  box-shadow: 0px 10px 30px rgba(0,0,0,0.1);
  border-radius: 4px;
  margin: 20px 0px;
  text-align: center;
}

ul {
  padding: 0;
}

li {
  list-style-type: none;
  display: inline;
  font-size: 3em;
}

li a {
  color: #b0ba43;
}

li a:hover {
  color: #d9e837;
}


@media (max-width: 720px) {
  /* For a screen < 720px, this CSS will be read */
  .container {
    width: 500px;
  }
}

@media (max-width: 540px) {
  /* For a screen < 540px, this CSS will be read */
  .container {
    width: 300px;
  }
}