style.css

body {
  font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI",
    "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  padding: 20px;
  margin: 0;
  box-sizing: border-box;
}

section {
  position: relative;
  margin: 20px auto;
}

section fieldset {
  border: 1px solid #ccc;
  padding: 10px;
  box-sizing: border-box;
  border-radius: 4px;
}

section fieldset legend {
  width: -moz-fit-content;
  width: fit-content;
  font-weight: bold;
}

section button {
  cursor: pointer;
}

section button.copy {
  position: absolute;
  top: 0;
  right: 12px;
}

textarea {
  width: 100%;
  height: 120px;
  min-height: 120px;
  background-color: #323232;
  box-sizing: border-box;
  color: #fafafa;
  border-radius: 4px;
  border: none;
  outline: none;
  resize: vertical;
}

textarea::selection {
  background: #a8d1ff;
}
textarea::-moz-selection {
  background: #a8d1ff;
}

section button {
  padding: 2px 4px;
  border-radius: 2px;
  border: 1px solid #c3c3c3;
  background-color: #E6E7E7;
}

section button:hover,
section button:focus {
  outline: none;
  box-shadow: none;
  border: 1px solid #848d95;
}

section.credentials {
  display: grid;
  gap: 50px;
  grid-template-columns: 1fr 150px;
  align-items: center;
  min-width: 400px;
  max-width: 1000px;
  width: 80%;
}

section.response {
  min-width: 500px;
  max-width: 1000px;
  width: 80%;
}

section.credentials fieldset {
  display: flex;
  gap: 10px;
  flex-direction: column;
  padding: 20px;
}

section.credentials aside {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
}

section.credentials aside button {
  padding: 8px 0;
}

section.credentials fieldset label {
  display: grid;
  gap: 10px;
  grid-template-columns: 80px 1fr;
  margin-bottom: 10px;
}

section.credentials fieldset label span {
  position: relative;
  font-size: 14px;
}

section.credentials fieldset label.required span::after {
  position: absolute;
  content: "*";
  color: #f44336;
  right: -2.5px;
}

section.credentials fieldset label input {
  border-radius: 2px;
  border: 1px solid #ccc;
  outline: none;
  padding: 5px;
  color: #5f6368;
}

section.credentials fieldset label input:focus {
  border: 1px solid #848d95;
}

section.credentials fieldset label:nth-last-child(1) {
  margin-bottom: 0;
}

@media only screen and (max-width: 600px) {
  section.credentials {
    gap: 10px;
    grid-template-columns: 1fr;
    min-width: inherit;
    width: 100%;
    margin-bottom: 50px;
  }

  section.response {
    min-width: inherit;
    width: 100%;
    margin-bottom: 50px;
  }
}

p.credits {
  pointer-events: none;
  cursor: default;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  width: 100%;
  text-align: center;
  color: #323232;
  font-size: 12px;
  padding: 10px 0;
  background-color: rgba(255, 255, 255, 0.5);
}