index.css

body {
  margin: 0;
  width: 100vw;
  height: 100vh;
  background: linear-gradient(74deg,#3DEBB0 1%,#8956F3 99%);
  display: flex;
  align-content: center;
  align-items: center;
  font-family: OCR A Std, monospace;
}
header {
  position: absolute;
  top: 8%;
  width: 100%;
  text-align: center;
  color: purple;
}
#content {
  position: absolute;
  right: 50%;
  transform: translate(50%, 0);
  display: flex;
  align-content: center;
  align-items: center;
  background: transparent;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border:0 solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  
  width: 300px;
  height: 250px;
  border-radius: 10px;
  
  overflow: hidden;
}
#form {
  position: absolute;
  width: 300px;
  height: 250px;
  
  transition: 1s;
}
.text-field {
  position: absolute;
  right: 50%;
  top: 30px;
  transform: translate(50%, 0);
}
.text-field input {
  outline: none;
  border-radius: 10px;
  
  background: transparent;
  backdrop-filter: blur(10px);
  border-style: solid;
  border-color: white;
  padding: 10px;
  
}
.calculoBtn {
  position: absolute;
  background-color: #df2c14;
  color: white;
  
  width: 70px;
  height: 35px;
  border-radius: 10px;
  border: none;
  
  right: 50%;
  bottom: 30px;
  transform: translate(50%, 0);
  
  transition: .5s;
}
.calculoBtn:hover {
  background-color: #c61a09
}
#results {
  position: relative;
  width: 300px;
  height: 250px;
  display: flex;
  align-content: center;
  align-items: center;
  background-color: transparent;
  border-radius: 10px;
  left: 300px;
  
  transition: 1s;
}
.voltarBtn {
  position: absolute;
  width: 70px;
  height: 35px;
  top: 5px;
  left: 5px;
  border-radius: 10px;
  background-color: transparent;
  border-style: solid;
  border-color: white;
  color: black;
  transition: 1s;
}
.voltarBtn:hover {
  background-color: white;
}
#resultados {
  position: absolute;
  right: 50%;
  transform: translate(50%, 0);
}