.big-btn {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
  flex-direction: column;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  width: 120px;
  height: 120px;
  padding: 0 16px;
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
  border-radius: 50%;
  text-decoration: none;
  background-color: rgba(255, 255, 255, .975);
}

.big-btn:hover,
.big-btn:focus {
  background-color: rgba(126, 139, 145, .9);
  color: #fff;
}

.big-btn:hover svg,
.big-btn:focus svg {
  fill: #fff;
}

.big-btn svg {
  display: block;
  width: 26px;
  height: 26px;
  margin: 4px auto 0;
  fill: #839297;
}

.big-btn-outline {
  border: 1px solid;
  background-color: transparent;
}

@media screen and (min-width: 600px) {
  .big-btn {
    width: 170px;
    height: 170px;
    padding: 0 30px;
    font-size: 16px;
  }
}