style.css

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}
body {
  display: grid;
  place-content: center;
  min-height: 100vh;
  background-color: #1bb295;
}

/* Wrapper */
.wrapper {
  width: 430px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}
.wrapper h1 {
  font-size: 25px;
  font-weight: 500;
  padding: 20px 25px;
  border-bottom: 1px solid #ccc;
}
.wrapper .content {
  margin: 25px 25px 35px;
}

/* Content */
.content .inputs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.inputs input {
  height: 57px;
  width: 56px;
  margin: 4px;
  font-size: 24px;
  font-weight: 500;
  color: #1ba98c;
  text-align: center;
  border-radius: 5px;
  background: none;
  pointer-events: none;
  text-transform: uppercase;
  border: 1px solid #b5b5b5;
}
.typing-input {
  opacity: 0;
  z-index: -999;
  position: absolute;
  pointer-events: none;
}
.inputs input:first-child {
  margin-left: 0px;
}
.content .details {
  margin: 20px 0 25px;
}
.details p {
  font-size: 19px;
  margin-bottom: 10px;
}

/* Reset Btn */
.content .reset-btn {
  width: 100%;
  border: none;
  cursor: pointer;
  color: #fff;
  outline: none;
  padding: 15px 0;
  font-size: 17px;
  border-radius: 5px;
  background: #1bb295;
  transition: all 0.3s ease;
}
.content .reset-btn:hover {
  background: #18a589;
}

/* Media Queries */
@media screen and (max-width: 460px) {
  .wrapper {
    width: 100%;
  }
  .wrapper h1 {
    font-size: 22px;
    padding: 16px 20px;
  }
  .wrapper .content {
    margin: 25px 20px 35px;
  }
  .inputs input {
    width: 50px;
    height: 51px;
    margin: 3px;
    font-size: 22px;
  }
  .details p {
    font-size: 17px;
  }
  .content .reset-btn {
    padding: 14px 0;
    font-size: 16px;
  }
}