styles.css

body {
  font-family: -apple-system,BlinkMacSystemFont,San Francisco,Roboto,Segoe UI,Helvetica Neue,sans-serif;
  margin: auto;
  padding: 0;
  font-size: 16px;
}

a {
  cursor: pointer;
}

h1, h2, p, input, textarea, small {
  margin-bottom: 1rem;
}

code {
  display: block;
  margin: 1em 0px;
  white-space: pre-wrap;
  word-break: break-word;
}

input:not([type="checkbox"]), textarea {
  font-size: 1.4rem;
  padding: 1rem;
  border-radius: 4px;
  width: 100%;
  box-shadow: none;
  border: 1px solid #c4cdd5;
  outline: none;
}

input:not([type="checkbox"]):focus, textarea:focus {
  border-color: #5c6ac4;
  box-shadow: inset 0 0 0 0 transparent, 0 0 0 1px #5c6ac4;
}

input[type="checkbox"] {
  display: inline-block;
  margin: 0 0.8rem;
  margin-left: 0;
}

textarea {
  min-height: 100px;
}

label {
  display: block;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

small {
  display: block;
}

button {
  fill: #637381;
  position: relative;
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  min-height: 3.6rem;
  min-width: 3.6rem;
  margin: 0;
  padding: .7rem 1.6rem;
  background: linear-gradient(180deg,#fff,#f9fafb);
  border: 1px solid #c4cdd5;
  box-shadow: 0 1px 0 0 rgba(22,29,37,.05);
  border-radius: 3px;
  line-height: 1;
  color: #212b36;
  font-size: 1.4rem;
  text-align: center;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  text-decoration: none;
  transition-property: background,border,box-shadow;
  transition-duration: .2s;
  transition-timing-function: cubic-bezier(.64,0,.35,1);
}

button:hover {
  background: linear-gradient(180deg,#f9fafb,#f4f6f8);
  border-color: #c4cdd5;
}

button:focus {
  border-color: #5c6ac4;
  outline: 0;
  box-shadow: 0 0 0 1px #5c6ac4;
}

button:active {
  background: linear-gradient(180deg,#f4f6f8,#f4f6f8);
  border-color: #c4cdd5;
  box-shadow: 0 0 0 0 transparent, inset 0 1px 1px 0 rgba(99,115,129,.1), inset 0 1px 4px 0 rgba(99,115,129,.2);
}

button + button {
  margin-left: 1rem;
}

ul {
  padding-left: 2rem;
  text-align: left;
}

li {
  margin-bottom: 0.5em;
}

.select-wrapper {
  position: relative;
  z-index: 10;

  background: #f0f0f0;
  padding: 1rem;
  border-bottom: 1px solid #cacaca;
  margin-bottom: 1em;
}

.tab-content {
  padding: 1em;
}

.bonus {
  color: #E91E63;
}

input.bonus, input.bonus:focus {
  border: 2px solid #E91E63;
  box-shadow: none;
}

.modal {
  width: 400px;
  left: 50%;
  top: 30%;
  margin-left: -200px;
  min-height: 100px;
  background-color: #fff;
  box-shadow: 0px 0px 25px 10px rgba(0, 0, 0, 0.12);
  z-index: 5;
  padding: 2rem;
  position: fixed;
  border-radius: 3px;
  outline: 9999px solid rgba(0,0,0,0.25);
}

.products {
  list-style: none;
}

.products li {
  display: flex;
  margin: 0;
  padding: 1.5rem 1rem;
  align-items: center;
  font-weight: 500;
  border-bottom: 1px solid #EFEFEF;
}

.products--selectable li {
  cursor: pointer;
}

.products--selectable li:hover {
  background: #eee;
}

.products img {
  width: 70px;
  margin-right: 2rem;
}

hr {
  border: none;
  border-bottom: 1px solid #eee;
}

h1 {
  margin-top: 0.5em;
  margin-bottom: 1em;
  font-size: 2em;
  font-size: bold;
}

h2 {
  margin-top: 1em;
  margin-bottom: 1.5em;
  font-size: 1.5em;
  font-size: bold;
}