buzzers/public/style.css

* {
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  margin: 2em 1em;
  line-height: 1.5em;
  text-align: center;
}

h1 {
  font-style: italic;
  color: #373fff;
  line-height: 1.1;
}

form {
  background-color: #eee;
  display: grid;
  grid-gap: 1em;
  padding: 1em;
  max-width: 40ch;
  margin: 0 auto;
}

label {
  font-weight: bold;
}

input[type=text] {
  text-transform: lowercase;
}

input {
  border: 1px solid silver;
  display: block;
  text-align: center;
  font-size: 16px;
  margin-bottom: 10px;
  padding: 5px;
  width: 100%;
}

form button {
  background-color: #bbbbf2;
  border: 2px solid currentColor;
  border-radius: .25em;
  cursor: pointer;
  font-size: inherit;
  line-height: 1.4em;
  padding: 0.25em 1em;
}

form button:hover {
  background-color: lavender;
}

footer {
  margin-top: 3em;
  padding-top: 1.5em;
  border-top: 1px solid lightgrey;
}

#buzzer {
  width: 95vw;
  height: 95vw;
  max-height: 500px;
  max-width: 500px;
  margin: 0 auto;
  margin-left: -8px;
  border-radius: 500px;
  background: red;
  border: 4px solid black;
  box-shadow: 4px 4px 4px rgba(0,0,0,.5);
  font-size: 4em;
  color: white;
  text-shadow: 2px 2px 2px black;
}

#buzzer.active {
  background: greenyellow;
  box-shadow: inset 4px 4px 4px rgba(0,0,0,.5);
}

#buzzer:active {
  box-shadow: inset 4px 4px 4px rgba(0,0,0,.5);
}

#buzzer:disabled {
  filter: grayscale(50%);
  opacity: .5;
}

h2 img {
  max-height: 40px;
}

figure.participant {
  display: inline-block;
  transition: ease-in all .2s;
  margin: 0;
}

figure.participant img {
  max-width: 40vw;
  width: 150px;
}
figure.participant figcaption {
  font-weight: bold;
  font-size: 1.3em;
}

.buzzed {
  background: yellow;
  animation: shake 1s cubic-bezier(.36,.07,.19,.97) both;
  transform: scale(1) rotate(0);
  backface-visibility: hidden;
}

@keyframes shake {
  10%, 90% {
    transform: rscale(1.3) otate(-10deg);
  }

  20%, 80% {
    transform: rscale(1.3) otate(20deg);
  }

  30%, 50%, 70% {
    transform: scale(1.3) rotate(-30deg);
  }

  40%, 60% {
    transform: scale(1.3) rotate(30deg);
  }
}

#messageBox {
  position: fixed;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  height:100px;
  background: #bbbbf2;
  border: 3px solid black;
  font-size: 1.3em;
  font-weight: bold;
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
}

#messageBox img {
  max-height: 50%;
}

#messageBox.hide {
  display: none;
}