main {
  font-size: 1.05rem;
  margin: 80px auto;
  width: 90%;
  padding: 10px 10px;
  letter-spacing: 0.6px;
  background-color: var(--bg-color04);
}

main li {
  margin-left: 25px;
}

h1 {
  text-align: center;
  margin: 0 auto 20px auto;
  color: black;
}

header {
  font-size: 1.5rem;
  margin-bottom: 50px;
  padding-left: 20px;
  background-color: var(--bg-color01);
  color: white;
}

.heading-rule {
  margin-bottom: 20px;
}

.id-locate {
  height: 50px;
}

.grid-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 30px;
}

.grid-item1 {
  text-align: left;
  overflow: hidden;
}

pre {
  background-color: var(--bg-color03);
  overflow: auto;
  margin-bottom: 10px;
  border-radius: 5px;
}

code {
  color: var(--text-color01);
  background-color: var(--bg-color03);
}

.text-code {
  color: var(--text-color03);
}

.html-attribute {
  color: var(--text-color02);
}

.css-selector {
  color: var(--text-color05);
}

.syntax-remarks {
  margin-top: 50px;
  color: var(--text-color04);
}

.css-values-title {
  font-weight: bold;
}

.text-container {
  margin-bottom: 1rem;
}

.img-chrome-devtools {
  width: 60%;
  max-width: 800px;
  cursor: pointer;
  transition: 0.3s;
}

.img-chrome-devtools:hover {
  box-shadow: 0 0 11px rgba(33, 33, 33, 1);
}

/* Modal */
.chromedev-container {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 99; /* Sit on top */
  padding-top: 100px; /* Location of the box */
  left: 0;
  top: 0;
  width: 100%; /* Full width */
  height: 100%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0, 0, 0); /* Fallback color */
  background-color: rgba(0, 0, 0, 0.9); /* Black w/ opacity */
}

/* Image inside modal*/
.modal-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 900px;
}

/* Add Animation */
.modal-content {
  -webkit-animation-name: zoom;
  -webkit-animation-duration: 0.6s;
  animation-name: zoom;
  animation-duration: 0.6s;
}

@-webkit-keyframes zoom {
  from {
    -webkit-transform: scale(0);
  }
  to {
    -webkit-transform: scale(1);
  }
}

@keyframes zoom {
  from {
    transform: scale(0);
  }
  to {
    transform: scale(1);
  }
}

/* The Close Button */
.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}

.close:hover,
.close:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}

.box-model-grid {
  width: 90%;
  min-width: 300px;
  margin-left: auto;
  margin-right: auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  column-gap: 80px;
  margin-bottom: 100px;
}

.box-grid {
  display: grid;
  grid-template-rows: 30px 1fr;
  row-gap: 20px;
  justify-content: center;
}

.box-model-img {
  border: 1px solid black;
  width: 60%;
  min-width: 120px;
  box-shadow: 3px 3px 3px #aaaaaa;
}

hr {
  margin: 20px 0;
}

.reference-link {
  text-decoration: underline;
  color: blue;
}

/* large screen */
@media (min-width: 1400px) {
  .grid-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 30px;
  }

  .grid-item2 {
    padding-top: 6px;
  }
}

/* Tablet screen */
@media (max-width: 1200px) {
  main {
    width: 95%;
  }

  .grid-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 20px;
  }

  .grid-item2 {
    padding-top: 6px;
    max-height: 650px;
    overflow-y: scroll;
  }
}

/* Mobile screen */
@media (max-width: 580px) {
  main {
    width: 98%;
    margin: 60px auto;
  }

  .grid-container {
    display: grid;
    grid-template-columns: 1fr;
  }

  pre {
    margin-bottom: 5px;
  }

  .modal-content {
    width: 90%;
  }

  .box-model-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
  }

  .box-grid {
    row-gap: 15px;
    justify-content: center;
    align-items: center;
  }

  .img-chrome-devtools {
    width: 80%;
  }
}

/* Mobile screen with smaller screen*/
@media (max-width: 320px) {
  main {
    width: 100%;
    margin: 55px auto;
  }

  .grid-container {
    display: grid;
    grid-template-columns: 1fr;
  }

  pre {
    margin-bottom: 5px;
  }

  .box-model-grid {
    display: grid;
    grid-template-columns: 1fr;
    row-gap: 30px;
    margin-bottom: 25px;
    min-width: 320px;
  }

  .box-grid {
    row-gap: 15px;
    justify-content: center;
  }

  .img-chrome-devtools {
    width: 80%;
  }
}