h1 {
  font-family: sans serif;
  font-size: 3em;
  text-align: center;
  margin: 0 0 10px 0;
  color: #353535;
  padding: 20px 5px 20px 5px;
}

.flex-wrapper {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  justify-content: flex-start;
}

.footer {
  margin-top: auto;
}

.container {
  background: white;
  
  background-color: rgba(255, 255, 255, 0.7);
  border-style: solid;
  
  
  
  width: 30em;
  padding: 2em 4vw;
  margin: 0 auto;
  font-family: serif;
  font-weight: bold;
}

#result {
  margin: 2em 1em;
  height: 10em;
  border-style: solid;
}

h4 {
  margin: 1em;
}

.label {
  text-align: right;
}

.label, .select {
  width: 47%;
  display: inline-block;
}

select {
  font-family: serif;
  height: 2em;
  margin: .5em;
  border-radius: 1px;
  width: 12em;
}

#seconds {
  display: none;
  margin: 0 auto;
  width: 20%;
  text-align: center;
}

#btn {
  text-align: center;
  color: white;
}

button {
  display: none;
  border: .5px solid #000000;
  height: 2em;
  color: #000000;
  font-family: serif;
}