body {
  display: block;
  text-align: center;
  align-items: center;
  justify-content: center;
  background-color: hsl(30, 84%, 79%);
  font-family: Arial, Helvetica, sans-serif;
}

.container {
  max-width: 400px;
  margin: 5% auto;
  border-radius: 2%;
  background-color: hsl(30, 84%, 86%);
  padding: 1em;
}

.Heading {
  font-size: 1.5em;
  padding: 0.5em;
}

.timer {
  font-size: 3em;
  margin: 20px;
}

#start {
  font-size: 1.5em;
  margin-bottom: 20px;
  margin-right: 10px;
  background-color: hsl(30, 84%, 96%);
  color: hsl(29, 83%, 12%);
  border: none;
  border-radius: 10%;
  padding: 0.25em;
}
#start:hover {
  font-size: 1.5em;
  margin-bottom: 20px;
  margin-right: 10px;
  background-color:  hsl(29, 63%, 69%);
  color:hsl(30, 84%, 96%);
  border: none;
  border-radius: 10%;
  padding: 0.25em;
}
#reset {
  font-size: 1.5em;
  margin-bottom: 20px;
  margin-left: 10px;
  background-color: hsl(30, 84%, 96%);
  color: hsl(29, 83%, 12%);
  border: none;
  border-radius: 10%;
  padding: 0.25em;
}

#reset:hover {
  font-size: 1.5em;
  margin-bottom: 20px;
  margin-right: 10px;
  background-color:  hsl(29, 63%, 69%);
  color:hsl(30, 84%, 96%);
  border: none;
  border-radius: 10%;
  padding: 0.25em;
}

#mode {
  font-size: 1.5em;
  color: hsl(29, 83%, 12%);
  padding: 1em;
}
#alert {
  font-size: 1em;
  color: rgb(194, 17, 17);
  padding: 1em;
  opacity: 0;               /* start hidden */
  transition: opacity 1s;   /* fade in/out over 1 second */
}