:root {
  --cd-back-to-top-size: 40px;
  --cd-back-to-top-margin: 20px;
  --font-primary: "Bitter", sans-serif;
  --font-secondary: "Open Sans", sans-serif;
  --cd-back-to-top-size: 60px;
  --cd-back-to-top-margin: 30px;
}

.js-cd-top {
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s, visibility 0.3s, background-color 0.3s;
}

.cd-top {
  position: fixed;
  bottom: var(--cd-back-to-top-margin);
  right: var(--cd-back-to-top-margin);
  display: inline-block;
  height: var(--cd-back-to-top-size);
  width: var(--cd-back-to-top-size);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
  background: url(../img/cd-top-arrow.svg) no-repeat center 50%;
  background-color: #e86154;
}

.cd-top--is-visible {
  visibility: visible;
  opacity: 1;
}

.cd-top--fade-out {
  opacity: 0.5;
}

.cd-top:hover {
  background-color: #e86154;
  opacity: 1;
}