uccser/cs-field-guide

.interactive-checksum-calculator-number-type[type="text"] {
  font-family: monospace;
  font-size: 1.5rem;
  margin: 0;
}
.interactive-checksum-calculator-feedback {
  color: red;
  font-weight: bold;
}
#interactive-checksum-calculator-sums {
  display: -webkit-flex; /* Safari */
  display: flex;
  -webkit-flex-wrap: wrap; /* Safari */
  flex-wrap: wrap;
  -webkit-align-items: center; /* Safari */
  align-items: center;
  -webkit-justify-content: flex-start; /* Safari */
  justify-content: flex-start;
  -webkit-align-content: flex-start; /* Safari */
  align-content: flex-start;
  margin-bottom: 0.5rem;
}
#interactive-checksum-calculator-sums div {
  font-family: monospace;
  font-size: 1.5rem;
  padding: 0 0.3rem;
  flex: 0 1 auto;
  border: 1px solid #ccc;
  text-align: center;
}
#interactive-checksum-calculator-calculation-controls,
#interactive-checksum-calculator-result {
  display: none;
}
#interactive-checksum-calculator-reset {
  margin-bottom: 1rem;
}