body, html{
    margin: 0;
    padding: 0;
    height: 100%;
}
nav a.active{
    color: #3b82f6;
    border: #3b82f6 solid 5px;
    border-radius: 25%;
    
}
.hero{
    position:relative;
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: black;
    font-size: 1rem;
    background-size: cover;
    background-position: center;
    transition: background-image 1s ease-in-out;
}
.ontop{
    position: absolute;
    top: 0; left: 0;
    width: 100%;height: 100%;
    background: rgba(0,0,0,0.4);
}
.content{
    min-height: 50vh;
    z-index: 200;
}