*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
}
section{
    position: relative;
    z-index: 999;
}
header{
    position: relative;
    width: 100%;
    height: 1000px;
    text-align: center;
}
.logo{
    display: inline-block;
    margin-top: 3rem;
}
.first-hill{
    position: absolute;
    right: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: url(../img/first-hills.png) no-repeat;
    background-size: contain;
    background-position: right bottom;
    z-index: 4;
}
.second-hill {
    position: absolute;
    right: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: url(../img/second-hills.png) no-repeat;
    background-size: contain;
    background-position: left bottom;
    opacity: .6;
    z-index: 3;
}
.third-hill {
    position: absolute;
    right: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: url(../img/third-hills.png) no-repeat;
    background-size: contain;
    opacity: .3;
    z-index: 2;
    background-position: right bottom;
}

h1{
    font-weight: 700;
    font-size: 10rem;
    text-transform: uppercase;
    letter-spacing: 2rem;
    position: relative;
    z-index: 3;
    margin-top: 4rem;
    opacity: .8;
}

h2 {
    font-weight: 600;
    font-size: 3rem;
    text-transform: uppercase;
    letter-spacing: .8rem;
    position: relative;
    z-index: 3;
    color: #2278EA;
}
h3{
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
p, li{
    color: #607D8B;
    font-size: .95rem;
    line-height: 1.65rem;
    margin-bottom: 1rem;
}
ul{
    list-style: none;
}
.btn-lg{
    padding: 1rem 2rem;
    border-radius: 50px;
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .2rem;
    box-shadow: 0 6px 23px -6px rgb(0, 123, 255);
    transition: all ease .6s;
}
.btn-lg:hover{
    box-shadow: 0 2px 10px -6px rgb(0, 123, 255);
    transition: all ease .6s;
}
@media (max-width:1200px) {
    header{
        height: 800px;
    }
    h1 {
        font-size: 5rem;
        letter-spacing: 2rem;
    }
    h2 {
        font-size: 1.5rem;
        letter-spacing: .4rem;
    }
}

@media (max-width:767px){  
    header {
        height: 500px;
    }
    h1{
        font-size: 2rem;
        letter-spacing: 1rem;
    }
    h2 {
        font-size: 1rem;
        letter-spacing: .1rem;
    }
}

@media (max-height:700px){ 
    .first-hill{display: none;}
 }