body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    text-align: center;
    background-image: url('https://ktipump.com.tr/image/background-mobile.webp');
    background-size: cover;
    background-position: center;
}
img, picture {
    display: table;
    max-width: 100%;
    height: auto
}
#hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-evenly;
    background-color: rgba(5,165,205,.35);
}
header {
    border-bottom: 1px solid rgb(90,90,90);
    padding: 20px;
}
h1 {
    margin: 0;
    font-size: 48px;
    font-weight: bold;
}
h2 {
    font-size: 64px;
    font-weight: bold;
    color: #fff;
    text-shadow: 2px 2px rgb(50,50,50);
}
main p {
    font-size: 24px;
    color: rgb(255,255,255);
    margin-top: 20px;
}
footer p {
    font-size: 16px;
    color: rgb(255,255,255);
}
@media only screen and (min-width:768px) {
    body {
        background-image: url('https://ktipump.com.tr/image/background-hd.webp');
    }
}
@media only screen and (min-width:1280px) {
    body {
        background-image: url('https://ktipump.com.tr/image/background-fhd.webp');
    }
}
@media only screen and (min-width:1920px) {
    body {
        background-image: url('https://ktipump.com.tr/image/background-4k.webp');
    }
}