css.css

body {
  color: #ffffff;
  background-color: #1b5e20;
}

body.end {
  color: #1b5e20;
  background-color: #ffffff;
}

h4 {
  margin-bottom: 0;
}

a:not(.chip):not(.btn) {
  color: #ffffff;
  font-weight: bolder;
  text-decoration: underline;
}
.end a:not(.chip):not(.btn) {
  color: #000000;
}

.flow-text:first-of-type,
.no-bottom-margin {
  margin-bottom: 0;
}
.flow-text:not(:first-of-type),
.no-margin {
  margin: 0;
}

.flow-text > span {
  vertical-align: middle;
}

#num-minutes {
  font-size: 5rem;
  height: 6rem;
  color: #ffffff;
  border-bottom: 1px solid #ffffff;
  -webkit-box-shadow: 0 1px 0 0 #ffffff;
  box-shadow: 0 1px 0 0 #ffffff;
}

#num-minutes:focus {
  border-bottom: 2px solid #ffffff;
  -webkit-box-shadow: 0 2px 0 0 #ffffff;
  box-shadow: 0 2px 0 0 #ffffff;
  transition: border-bottom 400ms, box-shadow 400ms, -webkit-box-shadow 400ms;
}

#num-minutes:focus + label {
  color: #ffffff;
  transition: color 400ms;
}

#start-btn {
  background-color: #ffffff;
  color: #1b5e20;
  height: 5rem;
  padding: 0 1em;
  font-size: 200%;
  line-height: 5rem;
}

#toolbox {
  bottom: 0;
  position: absolute;
  right: 0;
}

#toolbox i {
  cursor: pointer;
}

#timer-page {
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
  align-items: center;
  height: 100vh;

  --size: 1px;
}

#timer-page span {
  margin: 0;
  overflow-wrap: break-word; /* allow times to overflow line-height-wise */
  line-height: 1.2em;
}

#clock-mode-button-wrapper {
  position: fixed;
  right: 0;
  bottom: 0;
}

#clock-mode-button {
  background: #ffffff44;
  color: white;
  transition: background-color 300ms ease-in-out;
  border: 0;
  border-top-left-radius: 2rem;
  height: 4rem;
  width: 14ch;
  cursor: pointer;
}

#clock-mode-button:hover,
#clock-mode-button:focus {
  background: #ffffff66;
}