style.css

button {
  border: none;
  padding: 1rem;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  transition: all 300ms;
  cursor: pointer;
}

button[disabled] {
  cursor: not-allowed;
  background-color: gray !important;
}

button#iniciar {
  background-color: #30f03f;
}

button#iniciar:hover {
  background-color: #009500;
}

button#parar {
  background-color: #f0303f;
}

button#parar:hover {
  background-color: #950000;
}

select {
  border: none;
  padding: 1rem;
  background-color: lightgray;
  border-radius: 8px;
  cursor: pointer;
}

video {
  width: 50vw;
  /* Para espelhar a câmera */
  /*   transform: scaleX(-1); */
}

footer {
  position: fixed;
  bottom: 0px;
  left: 0px;
  width: 100%;
  background-color: lightgray;
  text-align: center;
  padding: 0.5rem 0;
  color: white;
}

@media (max-width: 760px) {
  video {
    width: 100%;
    max-height: 100%;
  }
}