* {
  box-sizing: border-box;
}

body {
  background: gray;
  color: white;
  margin: 0;
  padding: 50px 0;
  width: 100%;
  min-height: 100vh;
  text-align: center;
  box-sizing: border-box;
}

.num-to-word-block {
  display: inline-block;
  width: 500px;
  padding: 50px;
  background: #202A44;
  border: 1px solid black;
}
.num-to-word-block label:nth-child(1) {
  display: block;
  position: relative;
}
.num-to-word-block label:nth-child(1) span {
  display: block;
  text-align: left;
  text-transform: uppercase;
}
.num-to-word-block label:nth-child(1)::after {
  display: block;
  content: "";
  position: absolute;
  bottom: -2px;
  right: 0;
  width: 100%;
  height: 2px;
  background: white;
}
.num-to-word-block input[name=number] {
  width: 300px;
  border: none;
  font-size: 20pt;
  text-align: right;
  background-color: #202A44;
  color: gold;
}
.num-to-word-block input[name=number]:active {
  background-color: #202A44;
  border: none;
}
.num-to-word-block input[type=radio] {
  display: none;
}
.num-to-word-block input[type=radio] + span {
  margin: 10px -2px;
  display: inline-block;
  padding: 30px;
  position: relative;
}
.num-to-word-block input[type=radio] + span::after {
  content: "";
  display: block;
  position: absolute;
  bottom: -2px;
  right: 0;
  height: 2px;
  width: 0;
  background: gold;
  transition: all 0.5s ease-out;
}
.num-to-word-block input[type=radio] + span i {
  font-size: 20pt;
}
.num-to-word-block input[type=radio]:checked + span i {
  color: gold;
}
.num-to-word-block input[type=radio]:checked + span::after {
  width: 100%;
}

.num-to-word-convert p {
  text-align: left;
}
.num-to-word-convert p span:nth-child(1) {
  text-transform: uppercase;
}
.num-to-word-convert p span:nth-child(2) {
  display: block;
  height: 70px;
  width: 100%;
  border: 1px solid white;
  padding: 5px 10px;
  font-size: 14pt;
  color: #FF006F;
}
.num-to-word-convert p span:nth-child(2):first-letter {
  text-transform: uppercase;
}

.num-copy {
  width: 100%;
  cursor: pointer;
}
.num-copy i {
  font-size: 20pt;
  color: #202A44;
}

.article {
  text-align: left;
  padding: 3% 25% 0;
}

a {
  color:yellow;
}