body {
  background: url(../img/survey.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.container {
  max-width: 960px;
}

.lh-condensed {
  line-height: 1.25;
}

.range-wrap {
  position: relative;
  margin: 0 auto 3rem;
}

.range {
  width: 100%;
}

.bubble {
  background: red;
  color: white;
  padding: 4px 12px;
  position: absolute;
  border-radius: 4px;
  left: 50%;
  transform: translateX(-50%);
}

.bubble::after {
  content: "";
  position: absolute;
  width: 2px;
  height: 2px;
  background: red;
  top: -1px;
  left: 50%;
}