First/css/style.css

body {
    margin: 0;
    font-family: 'Montserrat', sans-serif;
    background-color: rgba(0, 0, 0, 0.014);
    line-height: 1.6;
    font-size: 16px;
}

h1, h2,h3, h4, h5, h6{
    margin:0;
}

*,
*:after,
*:before {
    box-sizing: border-box;
}

/*intro*/
.intro {
    height: 100vh;
    width:100%;
    background: url("../images/intro.jpg") center no-repeat ;
    background-size: cover;
    -webkit-background-size:cover;
}

.intro_title{
    font-size: 150px;
    font-weight:700;
    text-transform: uppercase;  
    text-align: center;
    line-height: 1;
}

/*header*/
.header{
    padding-top: 30px;
    width: 100%;
    position:absolute;
    top: 0;
    left: 0;
    right:0;
    z-index: 1000;
}

.header_inner{
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header_logo {
    font-size: 30px;
    font-weight:700;
    color: #fff;
}

.nav{
    font-size: 14px;
    text-transform: uppercase;
  

}

.nav_link{
    display: inline-block;
    vertical-align: top;
    margin: 0 15px;
    position: relative;
    color: #fff;
    text-decoration: none;
    transition: color 0.2s linear;
}

.nav_link:after{
    content:"";
    display:block;
    width: 100%;
    height: 3px;
    opacity: 0;
    background-color:#fce38a;
    position: absolute;
    top:100%;
    left:0;
    z-index: 1;
    transition: opacity .2s linear;
}

.nav_link:hover
{
    color: #fce38a;
}
.nav_link:hover::after{
    opacity: 1;
}


.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}