body,
html {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-content: center;
  flex-wrap: wrap;
  width: 100vw;
  height: 100vh;
  font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS',
    'sans-serif';
  background-color: lightblue;
}

#buttons {
  display: flex;
  justify-content: space-evenly;
}

button {
  padding: 15px;
  border: solid 1px black;
  border-radius: 5px;
  font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS',
    'sans-serif';
  font-weight: bold;
  font-size: medium;
}

#textBtn {
  background-color: aqua;
}
#colorBtn {
  background-color: aquamarine;
}
#imgBtn {
  background-color: lightpink;
}

#changingBox {
  margin: 1rem;
  background-color: orange;
  width: 500px;
  height: 500px;
  text-align: center;
}

img {
  width: 400px;
  height: 400px;
}