.wp-block-search__button{

    border: none;
    -webkit-border-radius: 28px;
    border-radius: 28px;
    -webkit-box-shadow: none;
    box-shadow: none;
    color: inherit;
    cursor: pointer;
    display: inline-block;
    font-size: 18px;
    margin: 0;
    padding: 12px 24px;
    text-align: center;
    text-decoration: none;
    overflow-wrap: break-word;
    font-size: 16px;
    padding: 3px 20px;
    font-weight: bold;  
}