.button {
  background: #3498db;
  background-image: -webkit-linear-gradient(top, #3498db, #2980b9);
  background-image: -moz-linear-gradient(top, #3498db, #2980b9);
  background-image: -ms-linear-gradient(top, #3498db, #2980b9);
  background-image: -o-linear-gradient(top, #3498db, #2980b9);
  background-image: linear-gradient(to bottom, #3498db, #2980b9);
  -webkit-border-radius: 60;
  -moz-border-radius: 60;
  border-radius: 60px;
  font-family: Arial;
  color: #ffffff;
  font-size: 13px;
  padding: 10px 20px 10px 20px;
  text-decoration: none;
}

.btn:hover {
  background: #3cb0fd;
  background-image: -webkit-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -moz-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -ms-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -o-linear-gradient(top, #3cb0fd, #3498db);
  background-image: linear-gradient(to bottom, #3cb0fd, #3498db);
  text-decoration: none;
}

/* "Find Similar Questions" link next to Show Answer (Home, Homework, Calculator tabs) */
.similarButton {
  display: inline-block;
  vertical-align: top;
  border: 2px solid transparent;  /* same height as the Show Answer button */
  margin-left: 8px;
  background: #27ae60;
  background-image: linear-gradient(to bottom, #2ecc71, #27ae60);
  border-radius: 60px;
  font-family: Arial;
  color: #ffffff;
  font-size: 13px;
  padding: 10px 20px;
  text-decoration: none;
}

.similarButton:hover {
  background-image: linear-gradient(to bottom, #40d47e, #2ecc71);
  color: #ffffff;
  text-decoration: none;
}

/* "Similar Question from Class" link on homework questions */
.classButton {
  display: inline-block;
  vertical-align: top;
  border: 2px solid transparent;
  margin-left: 8px;
  background: #8e44ad;
  background-image: linear-gradient(to bottom, #9b59b6, #8e44ad);
  border-radius: 60px;
  font-family: Arial;
  color: #ffffff;
  font-size: 13px;
  padding: 10px 20px;
  text-decoration: none;
}

.classButton:hover {
  background-image: linear-gradient(to bottom, #a66bbe, #9b59b6);
  color: #ffffff;
  text-decoration: none;
}

/* Show Answer turns into the answer in place. A fixed width (long calculator answers
   wrap onto more lines) keeps the green button from moving. */
button.button {
  width: 130px;
  border: 2px solid transparent;
  cursor: pointer;
  white-space: normal;
  vertical-align: top;
}

button.button.answerShown {
  background: #eaf4fc;
  background-image: none;
  border-color: #2980b9;
  color: #1c5f8d;
  font-weight: bold;
  border-radius: 18px;
}