and its working now :)
the html
<div id="post-wrap">
    <div id="delete-button">
        <button id="button-delete"><p> Remove </p></button>
    </div>
</div>
the CSS
#post-wrap {
    position: relative;
    margin: 20px 0px 0px 20px;
    padding: 10px 10px 10px 10px;
    height: auto;
    min-height: 150px;
    width: 200px;
    border: 1px solid #ddd;
    border-radius: 4px 4px 4px 4px;
    background-color: #fff;
/*  box-shadow: rgba(0, 0, 0, 0.247059) 0px 3px 8px 0px; */
    -webkit-box-shadow: rgba(0, 0, 0, 0.2) 0px 1px 3px 0px
}
#delete-button{
    position: absolute;
    right: 10px;
    top: 10px;
    margin: 0px 0px 0px 0px;
    height: 30px;
    width: 225px;
    overflow: auto;
}
#button-delete {
    cursor: pointer;
    float: right;
    height: 30px;
    width: auto;
    border: 1px solid #bbb;
    border-radius: 4px 4px 4px 4px;
    background-color: #eee;
    background-image: -webkit-linear-gradient(top, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0) 100%);
    -webkit-box-shadow: rgba(0, 0, 0, 0.2) 0px 1px 3px 0px;
    display:none;
}
#button-delete p {
    margin: 0px 0px 0px 0px;
    padding: 0px 0px 0px 0px;
    font-family: calibri;
    font-weight: bold;
    font-size: 16px;
    color: #444;
}
#post-wrap:hover #button-delete{
    display:block;
}