index.css

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
    "Helvetica Neue", Arial, sans-serif;
  background-color: #fafafa;
  line-height: 1.15;
}
main {
  margin: 0 auto 4rem;
  max-width: 42rem;
  padding: 1rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 300;
}
p {
  font-weight: 400;
}
h1,
p {
  margin: 0 0 0.5rem 0;
}
ul {
  margin: 0.5rem 0 1rem;
  padding-inline-start: 2rem;
}

label {
  display: block;
  margin: 0.75rem 0;
}
input {
  display: block;
  height: 2rem;
  background-color: #fff;
  border: 1px solid #ccc;
  border-radius: 0.25rem;
  padding: 0.25rem 0.5rem;
  outline: none;
  width: 100%;
  margin: 0.25rem 0;
}
input:focus {
  border-color: #146eeb;
}
button {
  display: inline-block;
  cursor: pointer;
  padding: 0.5rem 0.75rem;
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.15;
  letter-spacing: 0.025rem;
  border: none;
  border-radius: 0.25rem;
  border: 1px solid #aaa;
  background-color: transparent;
  color: #444;
  outline: none;
  text-decoration: none;
  user-select: none;
  width: auto;
  height: auto;
  margin: 0 0.5rem 0.75rem 0;
}
button:hover,
button:focus {
  border-color: #555;
  color: #000;
}
button:disabled {
  background: #f0f0f0;
  cursor: not-allowed;
  color: #aaa;
  border-color: #ccc;
}

.loader {
  margin: 3rem auto;
  border: 0.25rem solid #146eeb;
  border-top: 0.25rem solid #eee;
  border-radius: 50%;
  width: 4rem;
  height: 4rem;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}