* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background: #333;
  font-family: sans-serif;
  font-size: 62.5%;
  overflow-x: hidden;
}

html {
  font-size: 62.5%;
}

.container h1 {
  /* This is how we can create gradient text color. */
  color: transparent;
  background: linear-gradient(to right, #ffffff, #00ddff);
  -webkit-background-clip: text;
  background-clip: text;
  -moz-background-clip: text;
  text-transform: uppercase;
  text-align: center;
  margin: 1rem;
  font-size: 3.8rem;
}

.box_shadow_container {
  /* This is how we can create stripe in CSS */
  background-image: repeating-linear-gradient(
    45deg,
    #d9d9d9 0,
    #d9d9d9 20px,
    #d6d6d6 40px,
    #d6d6d6 100px
  );
  margin: 0 15rem;
  padding: 2rem;
  border-radius: 1rem;
  display: flex;
  flex-direction: column;
}

.shadow_output {
  align-self: center;
  height: 10rem;
  width: 10rem;
  text-transform: uppercase;
  font-size: 1.25rem;
  font-weight: bold;
  background: #007bc3;
  display: grid;
  place-items: center;
  margin: 7rem 0;
  color: #fff;
}

.controllers_container {
  margin: 2rem;
  display: flex;
  justify-content: space-evenly;
}

.primary_control_container {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.primary_control_container > .input_container {
  display: flex;
  flex-direction: column;
}

.primary_control_container > .output_bg {
  flex-direction: row;
}

.primary_control_container > .input_container > label {
  display: flex;
  flex-direction: column;
  font-size: 1.5rem;
}
.primary_control_container {
  width: 35%;
}

.secondry_control_container {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.secondry_control_container > .input_container > label {
  font-size: 1.5rem;
}

.code_container {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.code_container > input {
  padding: 0.7rem;
  background: #c3c3c3;
  font-size: 1.4rem;
  color: #000000;
  border-radius: 0.3rem;
  outline: none;
  border: none;
}

.code_container > .btn {
  background: #0197ee;
  border: none;
  outline: none;
  padding: 1.12rem 0.5rem;
  color: #fff;
  font-size: 1.5rem;
  font-weight: bold;
  border-radius: 0.3rem;
  cursor: pointer;
  transition: all 0.05s;
}

.code_container > .btn:active {
  scale: 0.98;
}

.author > p {
  font-size: 1.5rem;
  transition: all 0.05s;
}

.author > p > a {
  color: #b40000;
  /* Awesome property to create gap between anchor tag and below underline */
  text-underline-offset: 5px;
}
.author > p > a:hover {
  text-decoration: none;
}

label,
.shadow_output {
  user-select: none;
}

@media (max-width: 1031px) {
  .box_shadow_container {
    padding: 4rem;
  }
  .box_shadow_container {
    margin: 0 12rem;
  }
  .container h1 {
    font-size: 3.3rem;
  }

  .controllers_container {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    justify-content: flex-start;
  }

  .primary_control_container {
    width: 100%;
  }
  .secondry_control_container {
    width: 100%;
  }
}

@media (max-width: 800px) {
  .box_shadow_container {
    padding: 1.2rem;
  }

  .box_shadow_container {
    margin: 0 8rem;
  }
  .container h1 {
    font-size: 3rem;
  }
}

@media (max-width: 666px) {
  .box_shadow_container {
    padding: 1.2rem;
  }

  .container h1 {
    font-size: 2.5rem;
  }

  .box_shadow_container {
    margin: 0 4rem;
  }
}

@media (max-width: 470px) {
  .box_shadow_container {
    padding: 1rem;
  }

  .container h1 {
    font-size: 1.8rem;
  }

  .box_shadow_container {
    margin: 0 2rem;
  }
  .author > p {
    font-size: 1.2rem;
  }
}

@media (max-width: 350px) {
  .box_shadow_container {
    padding: 0.5rem;
  }

  .container h1 {
    font-size: 1.5rem;
  }
  .author > p {
    font-size: 1rem;
  }
}

.highlighted {
  border: 8px solid red;
  padding: 20px;
}
