* {
  box-sizing: border-box;
}

.columns {
  float: left;
  width: 33.3%;
  padding: 8px;
}

.prices {
  list-style-type: none;
  border: 1px solid #242424;
  margin: 0;
  padding: 0;
  -webkit-transition: 0.3s;
  transition: 0.3s;
}

.prices:hover {
  box-shadow: 0 8px 12px 0 #028EB1;
}

.prices .header {
  background-color: #111;
  color: white;
  font-weight: bold;
  font-size: 25px;
}

.prices li {
  border-bottom: 1px solid #242424;
  padding: 20px;
  font-size: 115%;
  text-align: center;
}

.prices .grey {
  background-color: #3D3D3D;
  font-size: 30px;
}

.buttons {
  background-color: #028EB1;
  border: none;
  color: black;
  border-radius: 10px;
  padding: 10px 25px;
  text-align: center;
  text-decoration: none;
  font-size: 22px;
}

.buttons:hover {
background-color: #0ACEFD;
color:black;
}



@media only screen and (max-width: 600px) {
  .columns {
    width: 100%;
  }
}