style.css

header {
  height: 60px;
  text-align: center;
}

main {
  background-color: #0087de;
  height: 900px;
  text-align: center;
}

h1 {
  height: 38px;
  font-family: Roboto;
  font-size: 32px;
  font-weight: 300;
  letter-spacing: 0.6px;
  text-align: center;
  color: #1f233e;
  padding-top: 40px;
}

.logo {
  width: 110px;
  height: 28px;
  margin-top: 40px;
  object-fit: contain;
}

.container {
  width: 400px;
  margin: auto;
  text-align: center;
}

#input {
  width: 219px;
  height: 37px;
  border-radius: 3.2px;
  border: solid 0.8px #1f233e;
  background-color: inherit;
  display: block;
  margin: auto;
  font-family: Source Sans Pro;
  font-size: 14px;
  letter-spacing: 0.2px;
  text-align: center;
  color: #ffffff;
}

#shorten {
  width: 91px;
  height: 37px;
  border-radius: 3.2px;
  border: solid 0.8px #1f233e;
  background-color: inherit;
  margin-top: 48px;
  font-family: Source Sans Pro;
  font-size: 14px;
  letter-spacing: 0.2px;
  text-align: center;
  color: #ffffff;
  margin-right: -3px;
}

#shorten:hover {
  background-color: #1f233e;
  border: solid 0.8px #4a4a4a;
  color: #0087de;
  cursor: pointer;
}

#shorten:active {
  background-color: #ffffff;
  border: solid 0.8px #4a4a4a;
  color: #1f233e;
  cursor: pointer;
}

#responseField {
  min-width: 191px;
  min-height: 120px;
  border: solid 2px #ffffff;
  margin: auto;
  margin-top: 25px;
  font-family: Source Sans Pro;
  font-size: 16px;
  letter-spacing: 0.2px;
  text-align: center;
  color: #ffffff;
  overflow: auto;
}