:root {
  --main-font: 'Roboto', sans-serif;
  --font-color: #323238;

  --bg-color: #fff;

  --bg-card: #E1E1E6;
  --bg-card-selected: #02799D;
}

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

body {
  background-color: var(--bg-color);

  font-family: var(--main-font);
  color: var(--font-color);

  height: 100vh;

  padding: 2rem;
}

.page {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-direction: column;

  margin: 0 auto;

  height: 100%;

  max-width: 52.25rem;
}

.boxTimer nav {
  margin-top: 1rem;

  display: flex;
  justify-content: space-between;
}

.boxTimer nav button img {
  width: 2.5rem;
}

.focusTimer {
  font-size: clamp(5rem, 10vw + 1rem, 7.5rem);

  display: flex;
  justify-content: space-between;
}

#soundControls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 1rem;
}

.card {
  background-color: var(--bg-card);

  border-radius: 24px;

  padding: 1.5rem;

  transition: all .2s;
}

button {
  border: none;
  background-color: transparent;
  cursor: pointer;
}

.selected{
  background-color: var(--bg-card-selected);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}
.selected img{
  filter: brightness(10);
}


@media (min-width: 740px) {
  .page {
    flex-direction: row;
  }
  .card {
    padding: 2.2rem;
  }

  .boxTimer nav button img  {
    width: 3rem;
  }
}