html not updating css code example

Example: css not update

header
{

    background-color: #131921;
    display: flex;
    align-items: center;
    position: sticky;
    height: 10%;
    top: 0;
    z-index: 100;
    padding: 10px 0;

}

.register-logo
{

    background-color: white;
    border: 7px solid white;
    border-radius:  7px;
    margin-top: 20px;
    margin-bottom: 15px;
    margin-right: auto;
    margin-left: auto;
    object-fit: cover;
    justify-content: center;
    align-items: center;
}

.register-logo img
{

    width: 200px;

} 


form
{

    position: absolute;
    width: 300px;
    height: fit-content;
    display: flex;
    align-items: center;
    flex-direction: column;
    border-radius:  7px;
    box-shadow: 0px 1px 2xp 3px rgba(0,0,0,0.1);
    border: 1px solid lightgray;
    padding: 20px;
    top: 250;
    
}