* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 10px;
}

a {
  color: inherit;
  text-decoration: none;
}

.wrapper {
  padding: 0 2rem;
}

header {
  background-color: #ccc;
  display: flex;
  align-items: center;
  font-size: 2.4rem;
}

header h2 {
  font-size: 3rem;
  color: #333;
  padding: 3rem;
  margin: 0;
}

.header-links {
  padding: 3rem;
}
.header-links a {
  padding: 0.8rem;
  background-color: #616161;
  color: #fff;
  border: 1px solid #424242;
}

.header-links a:hover {
  background-color: #424242;
}

.spacer {
  display: flex;
  flex-grow: 1;
}

.popup {
  position: absolute;
  z-index: 10;
  top: 50%;
  left: 50%;
  margin-top: -25rem;
  margin-left: -20rem;
  height: 50rem;
  width: 40rem;
  overflow: auto;
  border: 1px solid #444;
  background: #fff;
  padding: 2rem;
  font-size: 2rem;
  -webkit-box-shadow: 0px 0px 0px 9999px rgba(0, 0, 0, 0.4),
    10px 10px 14px -1px rgba(0, 0, 0, 0.4),
    -10px 10px 14px -1px rgba(0, 0, 0, 0.4);
  box-shadow: 0px 0px 0px 9999px rgba(0, 0, 0, 0.4),
    10px 10px 14px -1px rgba(0, 0, 0, 0.4),
    -10px 10px 14px -1px rgba(0, 0, 0, 0.4);
}

.popup .close-btn {
  width: 3rem;
  height: 3rem;
  top: 2rem;
  right: 2rem;
}

.close-btn {
  position: absolute;
  opacity: 0.3;
}

.close-btn:hover {
  opacity: 1;
}

.close-btn::before,
.close-btn::after {
  position: absolute;
  content: " ";
  background-color: #333;
  height: 3rem;
  width: 0.2rem;
  right: 1rem;
}

.close-btn:before {
  transform: rotate(45deg);
}

.close-btn:after {
  transform: rotate(-45deg);
}

.popup-content {
  padding: 1rem 0;
}

.popup-content button {
  height: 4rem;
  width: 10rem;
  font-size: 1.8rem;
}

table.log-table {
  border: 1px solid #333;
  background-color: #eee;
  width: 100%;
  border-collapse: collapse;
}

table.log-table td,
table.log-table th {
  border: 1px solid #333;
  padding: 0.4rem 0.3rem;
}

table.log-table thead {
  background: #fff;
  border-bottom: 2px solid #444444;
}

table.log-table tr:nth-child(even) {
  background-color: #fff;
}

.timer-wrapper {
  font-size: 5.6rem;
  padding: 1.6rem;
  text-align: center;
}

.timer-wrapper #status {
  font-size: 2.8rem;
}

.btn-wrapper {
  text-align: center;
  padding: 1.6rem;
  max-width: 90rem;
  margin: 0 auto;
}

.btn-wrapper button {
  height: 6rem;
  font-size: 2rem;
  width: 100%;
  cursor: pointer;
  display: block;
}

.btn-wrapper .btn-select {
  color: #fff;
  height: 4rem;
  border: 1px solid #3949ab;
}

.btn-wrapper a {
  font-size: 3.2rem;
}

.btn-wrapper a:hover {
  text-decoration: underline;
}

.input-wrapper {
  padding: 1.6rem;
  padding-top: 0;
  max-width: 90rem;
  margin: 0 auto;
  text-align: center;
}

.input-wrapper .input {
  display: flex;
  flex-direction: column;
  padding: 0.8rem 1.6rem;
}

.input-wrapper input {
  font-size: 1.8rem;
  padding: 0.2rem;
}

.input-wrapper input[type="checkbox"] {
  transform: scale(1.5);
  margin-right: 1rem;
}

.input-wrapper label {
  padding: 0.4rem;
  font-size: 2.4rem;
}

button:focus {
  outline: none;
}

.hidden {
  visibility: hidden;
}

.btn-select {
  background-color: #039be5;
}

.selected,
.btn-select:hover {
  background-color: #1976d2;
}

.grey {
  background-color: #b0bec5;
}

.grey:hover {
  background-color: #90a4ae;
}

.active {
  background-color: #00e676;
}

.paused {
  background-color: #ff1744;
}

.active:hover {
  background-color: #00c853;
}

.paused:hover {
  background-color: #d50000;
}

.blue {
  background-color: #1e88e5;
}

.blue:hover {
  background-color: #1976d2;
}

@media only screen and (min-width: 600px) {
  .btn-wrapper {
    display: flex;
    justify-content: center;
  }
  .btn-wrapper button {
    width: 13rem;
    margin: 0 1rem;
  }
  .btn-wrapper .btn-select {
    width: 100%;
    margin: 0;
  }
  .input-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .input-wrapper .input {
    flex: 1 1 auto;
    min-width: 10rem;
  }
}