body {
  background-color: transparent;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  display: flex;
}

.btn__und-0030 {
  color: #2a3239;
  text-align: center;
  letter-spacing: 1px;
  text-transform: uppercase;
  flex: none;
  align-self: center;
  font-family: Exo, sans-serif;
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  display: inline-block;
  position: relative;
}

.und-0030__line {
  background-color: #2a3239;
  width: 0%;
  height: 6px;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.und-0030__line.line--uper {
  top: 0;
  bottom: auto;
  left: auto;
}

.und-0030__label {
  padding-top: 13px;
  padding-bottom: 11px;
}