.text-container{
  display: flex;
  gap: 18px;
  margin: 14px auto;
        }


.Text{
  flex: 1;
  padding: 14px;
  min-height: 140px;
  width: 60%; 
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin: 50; 
  text-align: justify; 
  
  
}

.welcome { 
  font-size: 20px;
  font-weight: bold; 
}


.BookCover{
  flex: 1;
  padding: 14px;
  min-height: 140px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  img { 
    margin: 15px;
    border: 20px solid lightblue; 
  }
  #buybook {
    text-align: center;
  
     a {
      background-color: lightblue;
      text-align: justify ; 
      padding: 3px; 
      border: 5px solid rgb(91, 91, 164); 
      border-radius: 25px; 

  }
  }
}

nav{ 
    background-color: lightblue;
    text-align: justify;
}


* { box-sizing: border-box; }

.Intro-Text h3{
  font-family: Arial, Helvetica, sans-serif;
  color:#2b3f54;
  font-size: 14px;
}

.Intro-Text h2{
  font-family: Arial, Helvetica, sans-serif;
  color:#203348;
}

body{
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: #203348;
  background: #ffffff;
  font-size: 18px;
}

body > *{
   width: 100%;

  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}

/* Header */
header{
  margin-top: 20px;
  border: 1px solid #c9cfd6;
  overflow: hidden;

}

header h1,
header h2{
  margin: 0;
  text-align: center;
  color: #ffffff;
}

header{
  background:
    linear-gradient(rgba(0,0,0,.45), rgba(0,0,0,.45)),
    url("assets/neuron .jpg"); /* <-- change this path */
  background-size: cover;
  background-position: center;
  padding: 18px 16px 10px;
}

header h1{
  font-size: 30px;
  font-weight: 700;
  letter-spacing: .2px;
}

header h2{
  font-size: 16px;
  font-weight: 600;
  opacity: .95;
  margin-top: 4px;
}

nav{
  margin-top: 14px;
  background: #e3e6ea;
  border-top: 1px solid rgba(255,255,255,.35);
  padding: 8px 12px;
  text-align: center;
  font-size: 13px;
}

nav a{
  color: #1f3a57;
  text-decoration: none;
  padding: 0 8px;
}

nav a:hover{ color: red;}

body > h2{
  margin: 22px auto 8px;
  font-size: 22px;
  color: #2b3f54;
}

body > h3{
  margin: 0 auto 18px;
  font-size: 14px;
  font-weight: 500;
  color: #3b4b5a;
  line-height: 1.35;
}

.row{
  display: flex;
  gap: 18px;
  margin: 14px auto;
}

.Materials{
  flex: 1;
  background: #dbe6f2;        
  border: 1px solid #c2cfdd;
  padding: 14px;
  min-height: 140px;

  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.Materials h3{
  margin: 0 0 6px;
  font-size: 15px;
}

.Materials h3 a{ 
  color: #2b5f93;
  text-decoration: underline;
}

.Materials p{
  margin: 0;
  font-size: 12.5px;
  line-height: 1.35;
  color: #2a3a48;
}

.Materials img{
  width: 100px;
  height: 140px;
  object-fit: cover;
  border: 1px solid #aab7c6;
  background: #fff;
  flex: 0 0 auto;
}


body > p{
  font-size: 14px;
  color: hwb(236 4% 76%);
  line-height: 1.4;
  margin: 10px auto;
}

body > p a{
  color: #2b5f93;
  text-decoration: underline;
}

footer { 
  font-size: 16px;
  padding: 20px; 
  font-family: 'Times New Roman', Times, serif;
}