main.css

:root {
  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

body {
  background: radial-gradient(
      circle at 100%,
      rgba(3, 6, 21, 0.9) 15%,
      rgba(189, 205, 226, 0.5) 5%,
      rgba(7, 9, 22, 0.9) 15%
    ),
    url('./public/chevron.png') center/cover;

  height: 100vh;
  padding: 40px 0;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 15px;
}

h1 {
  color: #fff;
  font-size: 1.5rem;
  text-transform: uppercase;
}

.btn-wrapper {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
}

button {
  display: flex;
  align-items: center;
  column-gap: 5px;
  border: none;
  cursor: pointer;
  padding: 12px 24px;
  border-radius: 3px;
  font-weight: 600;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  transition: opacity 400ms ease-in-out;
}

button:disabled {
  opacity: 0.47;
  cursor: default;
}

button:hover:not(:disabled) {
  opacity: 0.9;
}

button > svg {
  height: 1rem;
}

.btn-start {
  background-color: #ff2c4f;
  color: #fff;
}

.btn-stop {
  background-color: rgb(7, 2, 44);
  color: #fff;
}

.result {
  background-color: #fff;
  width: 100%;
  min-height: 200px;
  padding: 10px;
  border-radius: 3px;
  margin-top: 20px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  text-transform: capitalize;
}

.result:empty {
  display: none;
}

.hidden {
  display: none !important;
}

@media screen and (min-width: 768px) {
  h1 {
    font-size: 3.125rem;
    text-transform: capitalize;
  }

  .container {
    padding: 0 30px;
  }

  .result {
    padding: 15px;
  }
}