* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
h1 {
    color: white;
    background-color: black;
     padding: 10px;
 
}
p {
    color: white;
    background-color: black;
    margin-bottom: 20px;
    padding: 10px;
    box-shadow: 2px 6px 4px green;
}
div {
    color: white;
    background-color: black;
    margin-bottom: 20px;
    padding: 10px;
}
a { 
    display: inline-block;
    padding: 30px;
    background-color: rgb(228, 228, 20);
    margin-top: 10px;
    color: rgb(27, 24, 192);
    text-decoration: none;
    margin-bottom: 20px;
    transition: all 0.5s;
    
}
a:hover {
    transform: translateX(35px);
}
.bi , .bi-windows {
    font-size: 50px;
    color: red;
    
}
.bi-windows:hover{ 
    color: blue;

}

 span {
    display: block;
    background-color: black;
color: white;
height: 300px;
} 
.z1 {
    background: url(download.webp ) top/cover no-repeat fixed ;
    background-position: center;
}
.z2 {
    background: url(dog2.webp) 

}
@media screen and (max-width:767px ) {
    .z1 { background: black;}
    
}
@media screen and (min-width:768px) and (max-width:900px) {
    .z1 { background: yellow;}
    
}