style.css

@import url("https://fonts.googleapis.com/css2?family=SUSE:wght@100..800&display=swap");

* {
  margin: 0;
  padding: 0;
  /* font-family: "poppins"; */
  font-family: "SUSE", sans-serif;

  box-sizing: border-box;
}

body {
  background-color: #262a30;
}

.container {
  width: 400px;
  padding: 40px;
  border-radius: 10px;
  background-color: #fefefe;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: inset 0 0 80px #4c59f6;
}

.container p {
  font-weight: 800;
  font-size: 30px;
  text-shadow: 2px 2px 8px #4c59f6;
}
.container input {
  width: 100%;
  height: 30px;
  border: 3px solid black;
  border-radius: 20px;
  padding: 10px;
  margin: 15px 0;
}

button {
  background-color: #4c59f6;
  color: white;
  border-radius: 10px;
  width: 100%;
  height: 40px;
  font-weight: 800;
  cursor: pointer;
  transition: 0.2s;
}
button:hover {
  background-color: #242b76;
}

#imgBox {
  width: 100px;
  border-radius: 6px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 1s;
}

#imgBox img {
  width: 100%;
  padding: 10px;
}
#imgBox.show-img {
  max-height: 300px;
  margin: 10px auto;
  border: 1px solid black;
}