html{
    scroll-snap-type: y mandatory;
}

*{
    padding:0;
    margin:0;
    box-sizing: border-box;
    outline: none;
    font-family: '-apple-system', BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Open Sans, Helvetica Neue, sans-serif;
}
::-webkit-scrollbar{
    display: none;
}
header{
    background-position: center;
    background-size: cover;
    background-image: url('img/showcase.jpg');
    box-shadow: inset 50px 50px 250px #000,inset -50px -0px 250px #000;
    width: 100%;
    height: 100vh;
    color:white;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding:1rem;
}
a{
    color:white;
    text-decoration: none;
    display: inline-block;
    background: rgb(4, 27, 27);
    margin-top: 1rem;
    padding:.5rem 2rem;
    border-radius: 15px;
    transition: 1s background;
    
}
a:hover{
    background: rgb(3, 53, 52);
}
div{
    padding:.5rem 1rem ;
}
.section-b{
    background: cornflowerblue;
    color: #000;

}
.section-d{
    display: flex;
margin: 1rem;
}
.section>div{
    padding:1rem 0rem;
}
.section-d .one ,.section-d .three{
    background: cornflowerblue;
    color: black;
}