html - Angled background (triangle) button on hover -


i have following css/html puts 'back top' button on bottom right corner of window. when hovered over, background animates behind it.

the code works fine, trying triangle instead. in bottom right, , background animate up, on angle instead of straight up.

#top-btn {    position: fixed;    margin: 0;    padding: 0;    display: block;    bottom: 0;    right: 0;    z-index: 900;  }    #top-btn a,  #top-btn-bg {    position: absolute;    right: 0;    margin: 0;  }    #top-btn {    z-index: 999;    padding: 34px 35px;    color: #707070;    bottom: 0;  }    #top-btn-bg {    z-index: 950;    height: 75px;    width: 75px;    background-color: #333;    bottom: -75px;    -webkit-transition: bottom 0.35s ease;    -moz-transition: bottom 0.35s ease;    -ms-transition: bottom 0.35s ease;    -o-transition: bottom 0.35s ease;    transition: bottom 0.35s ease;  }    #top-btn a:hover {    color: #fff;  }    #top-btn a:hover+#top-btn-bg {    bottom: 0px;  }
<div id="top-btn" class="flex">    <a href="javascript:void(0);" onclick="scrolltop();"> button </a>    <div id="top-btn-bg"></div>  </div>

i want bottom-right corner triangle when hovered over

enter image description here

just use simple css triangle generator. http://apps.eky.hk/css-triangle-generator/


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