:root {
    --white-color: #fff;
    --black-color: #000;
    --yellow-color: #ffff00;
    --text-color: #333;
}
* {
    box-sizing: inherit;
}
html {
    font-size: 62.5%;
    line-height: 1.6rem;
    font-family: 'Roboto', sans-serif;
    box-sizing: border-box;

}
body {
  margin: 0 auto;
  display: block;
  float: none;
  position: relative;
  /*max-width: 100%;*/
}
header{
    box-sizing: border-box;
    height:150px;
    background-image: linear-gradient(45deg, #00469c, #88a8cb);
}
.grid{
    width: 1200px;
    max-width: 100%;
    margin: 0 auto;
    /*box-sizing: border-box;*/
}
.gird__full-width {
    width: 100%;
}
.grid__row {
    display: flex;
    flex-wrap: wrap;
}
.header__navbar{
    display: flex;
    justify-content: space-between;
}
.header__navbar-list {
    list-style: none;
    padding-left: 0;
    display: flex;
    margin: 0;
    /*text-decoration: none;*/
}

.head__navbar-item {
    font-size: 2rem;
    color: var(--yellow-color);
    text-decoration: none;
    margin: auto;
    text-align: center;
    font-weight: 300;
}
.head__navbar-item2 {
    display: inline-block;
    font-size: 1.5rem;
    color: var(--white-color);
    font-weight: 200;
    margin: 0 8px;
}

.header__menu {
    align-content:center;

}
.header__menu-list{
    justify-content: space-between;
    background: #ffff00;
}
.head__navbar-menu {
    display: inline-block;
    font-size: 1.6rem;
    color: var(--black-color);
    text-decoration: none;
    font-weight: 200;
    width: 12%;
    text-align: center;
    justify-content: space-between;
}

.head__navbar-menu a {
    text-decoration: none;
    color: var(--black-color);
    /*align-content: center;*/
}
.head__navbar-menu a:hover {
    color: #1b6d85;

}
.head__navbar-item-link{
    color: var(--white-color);
    text-decoration: none;
}

h1 {
    color: red;
    font-size: 1.8rem;
    margin: 0;
    padding: 0;
    text-align: center;

}

h2{
    font-size: 1.2rem;
    text-align: center;
}
h3{
    color: #990000;
    font-size: 2rem;
    font-weight: 400;
}
/*Home*/
.noidung{
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    display: block;
    /*float: none;*/
    position: relative;
    /*width: 100%;*/
    z-index: 1;
    box-sizing: border-box;
    background: whitesmoke;
}

.document {
    /*width: 800px;*/
    box-sizing: border-box;
    align-content: center;
    display: block;
}