.back-to-top {
  position: fixed;
  right: 0;
  bottom: 45px;
  background: url("../img/arrow1.png") no-repeat;
  height: 45px;
  width: 45px;
  display: none; }

.box {
  background-color: wheat;
  margin: 30px auto;
  width: 100px;
  height: 100px; }

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