Base css styles

base.css

:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-size: 16px;
  --primary-color: #0074d9;
  --primary-color-dark: #005cad;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size);
  margin: 1.5rem;
}

button {
  align-items: center;
  background-color: var(--primary-color);
  border: none;
  border-radius: .25rem;
  color: white;
  cursor: default;
  display: inline-flex;
  font-size: 1rem;
  font-weight: bold;
  justify-content: center;
  margin-right: 1rem;
  padding: .5rem 1rem;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.15s ease-in-out;
  user-select: none;
  white-space: nowrap;
}

button:hover {
  background-color: var(--primary-color-dark);
}

form {
  max-width: 30rem;
}

header {
  border-bottom: 1px solid #ccc;
  margin: 1rem 0;
}

h1 {
  margin: .5rem 0;
}

input[type='text'],
select,
textarea {
  background-color: white;
  border-radius: 4px;
  border: 1px solid #ccc;
  color: #495057;
  display: block;
  font-size: var(--font-size);
  height: 36px;
  margin: .25rem 0;
  padding: .5rem;
  width: 100%;
}

label {
  display: block;
  margin-bottom: 16px;
}

td, th {
  padding: 4px;
  text-align: left;
}