body {
  margin: 0;
  background-image: linear-gradient(to top left, #52E5E7, #130CB7);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: #fff;
  font-weight: 400;
}
#main-section {
  display: inline-block;
  background-image: linear-gradient(135deg, #52E5E7, #130CB7);
  padding: 20px 20px 10px;
  min-width: 300px;
  max-width: 90%;
  border-radius: 5px;
  overflow: hidden;
}
ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}
li {
  padding: 5px 0;
}
.key {
  display: inline-block;
}
.value {
  display: inline-block;
}
label {
  display: block;
  margin-bottom: 10px;
  font-weight: bold;
  font-size: 20px;
}
#caption {
  display: block;
  width: 100%;
  height: 40px;
  border: 0;
  outline: 0;
  margin-bottom: 5px;
  color: white;
  font-size: 20px;
  font-weight: bold;
  padding-left: 10px;
  box-sizing: border-box;
}
#range {
  width: 100%;
  accent-color: red;
}
.box, .value {
  float: right;
}
input {
  accent-color: red;
}
button  {
  background: red;
  color: #fff;
  outline: 0;
  border: 0;
  width: 100%;
  height: 40px;
  margin-top: 15px;
  font-size: 18px;
  transition: .2s;
  border-radius: 6px;
}

#copy {
  position: relative;
}
#copy-icon {
  position: absolute;
  top: 5px;
  right: 7px;
  font-size: 27px;
}
#copy-msg {
  position: absolute;
  top: -25px;
  right: 0;
  font-weight: bold;
  width: 0;
  height: 0;
  transition: .5s;
  overflow: hidden;
}