:root {
  color-scheme: dark light;
}

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  font-family: system-ui, sans-serif;
  max-width: clamp(320px, 90%, 1000px);
  margin: auto;
}

img {
  border-radius: 20%;
  width: 6rem;
  height: auto;
}

output {
  white-space: pre-wrap;
}

form {
  margin-block: 1rem;
}

input,
button {
  font: inherit;
}

input {
  width: 20rem;  
}

.speech-bubble {
  position: relative;
  background: #f0f0f0;
  border-radius: 12px;
  padding: 12px 20px;
  max-width: 300px;
  font-family: sans-serif;
  color: black;
  margin-block-end: 15px;
}

.speech-bubble::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 20px;
  width: 0;
  height: 0;
  border: 10px solid transparent;
  border-top-color: #f0f0f0;
  border-bottom: 0;
  margin-left: -10px;
}