index.css

body {
    margin: 0px auto;
    padding: 0;
    text-align: center;
    color: white;
    font-family: "Inter", sans-serif;
    max-width: 550px;
}

#container-Top {
    width: 550px;
    height: 285px;
    background: #6943FF;
    border: 3px solid black;
    border-radius: 30px 30px 0px 0px;
}

h1 {
    padding-top: 35px;
}

#input {
  display: block;
  border-radius: 5px;
  font-size: 50px;
  margin: 0px auto;
  width: 120px;
  font-size: 58px;
  font-weight: 800;
  background: #6943FF;
  border: 3px solid #B295FF;
  text-align: center;
  color: white;
}

#input:focus {
  outline: none;
  border: 3px solid #273549;
  color: lightgrey;
  text-shadow: 1px 1px 5px black;
}

#input:hover {
  cursor: pointer;
}

#convert-btn{
  margin-top: 25px;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  color: #3D3D3D;
  padding: 8px 25px;
  background: white;
  box-shadow: 0px 1px 2px 0px #00000D;
}

#convert-btn:hover{
  cursor: pointer;
}

#convert-btn:active{
  box-shadow: 0 0.5em 0.5em -0.4em #00000D;
  transform: translateY(-0.25em);
}

.conversionInfo {
  background: #273549;
  width: 500px;
  height: 110px;
  margin: 30px auto;
  color: #CCC1FF;
  width: 500px;
  border-radius: 5px 0px 0px 0px;
}

h3 {
  padding: 30px 0px 0px 0px;
  margin: 0px;
  font-size: 20px;
}

#lengthInfo, #volumeInfo, #massInfo {
  margin: 15px 0px 0px 0px;
  font-size: 14px;
}

#container-Bottom {
    width: 550px;
    height: 450px;
    background: #1F2937;
    border: 3px solid black;
    border-radius: 0px 0px 30px 30px;
}