Coding header Web Landing Page - Phần 3

/* #group.howkteam.com -> trao đổi, hỏi đáp, thảo luận
     #nhớ Like và Sub video youtube
     #Code: howkteam.com
     #Kho tài liệu: Howkteam.com/documentation
     #Hỏi đáp tại website: howkteam.com/questions => người khác tìm lại có đáp án  */
/* ----------------------------- */
/* -----DEFAULT SETUP */
/* ------------------------------- */
*{
  padding: 0px;
  margin: 0px;
  box-sizing: border-box;
}

html{
  font-family: 'Lato', sans-serif;
  font-size: 20px;
  color: #5a5a5a;
  background-color: #ffffff;
  text-rendering: optimizeLegibility;
  /* mac dinh la 16px */
}

/* ------------------------------------ */
/* -----REUSABLE COMPONENT--------- */
/* ----------------------------------- */
.btn{
  text-decoration: none;
  color: white;
  background-color: #e67e22;
  padding: 15px 30px;
  border-radius: 20px;
  margin: 0 5px;
  width: 190px;
  display: inline-block;
  text-align: center;
  transition: all .3s;
}

.btn:hover,
.btn:active{
  background-color: #d35400;
}

.clearfix::after{
  content: " ";
  display: table;
  clear: both;
}

.row{
  max-width: 1140px;
  margin: 0 auto;
}

h1{
  text-transform: uppercase;
  font-size: 300%;
  font-weight: 400;
  letter-spacing: 1px;
  word-spacing: 5px;
  color: white;
  line-height: 135%;
  margin-bottom: 50px;
}

/* -------------------------------------------- */
/* ------------------HEADER------------------ */
/* ------------------------------------------------ */
header{
  background-image: linear-gradient(45deg,rgba(2,33,64, 0.8) 55%,rgba(45,95,93,0.85)), url("../img/background4.jpeg");
  background-size: cover;
  background-position: center;
  height: 100vh;
  /* view height */
  background-attachment: fixed;
}

.logo{
  width: 350px;
  float: left;
  margin-left: 70px;
  margin-top: -50px;
}

.main-nav{
  float: right;
  list-style: none;
  margin-right: 50px;
  margin-top: 55px;
}

.main-nav li{
  display: inline-block;
  margin-right: 30px;
}

.main-nav li a{
  text-decoration: none;
  color: white;
  font-size: 110%;
  font-weight: 700;
  transition: border-bottom 0.5s;
  padding: 3px 0;
}

.main-nav li a:hover,
.main-nav li a:active{
  border-bottom: 2px solid #cccccc;
}

.heading-main-box{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-45%, -55%);
  width: 1140px;
}

/* ---------------------------- */
/* ---------ABOUT SECTION--------- */
/* ------------------------------------- */
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