index.css

html {
  background-color: #cccbc6;
  font-size: 16px;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  min-width: 300px;
  overflow-x: hidden;
  overflow-y: scroll;
  text-rendering: optimizeLegibility;
  text-size-adjust: 100%;
}

img {
  max-width: 100%;
}

body {
  color: #555;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  font-family: "Roboto";
}

span {
  font-style: inherit;
  font-weight: inherit;
}

#app {
  max-width: 1376px;
  margin: 0 auto;
}

.post {
  margin: 0;
  border-bottom: 1px solid #bbb;
  display: flex;
  list-style: none !important;
  background-color: #fff;
  border: none;
  margin: 0px 0px 0px 0px;
  padding: 0px 0px 0px 0px;
}

.postmain {
    flex-grow: 1;
    flex-shrink: 1;
    position: relative;
    border-bottom: 1px solid #bbb;
}

.postrender {
  box-sizing: inherit;
}

.posthead {
  margin: 0;
  padding: 0.3rem 0.6rem;
  height: auto;
  font-size: 0.7rem;
  color: rgba(85,85,85,0.5);
  background-color: #e6e6e6;
  border-bottom: 1px solid #bbb;
}

.posthead strong {
  color: rgba(85,85,85,0.8);
  font-weight: normal;
}

.postinner {
  display: flex;
}

.postuser {
  flex-basis: 200px;
  max-width: 200px;
  flex-shrink: 0;
  flex-grow: 0;
  padding: 0.5rem;
  border-right: 1px solid #bbb;
  box-sizing: border-box;
  position: relative;
  background-position: center;
  background-size: cover;
  background-color: rgba(0,0,0,0.5);
}

.background-image {
  z-index: 0;
  background-position: top center;
  background-position-y: -16px;
  background-repeat: repeat;
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  top: 0;
}

.background-image::after {
  content: '';
  backdrop-filter: grayscale(70%);
  background: linear-gradient(to bottom, rgba(255,255,255,0.8), #fff 496px);
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  top: 0;
}

.postcontent {
  background: linear-gradient(to right, #e6e6e640, #fff 512px);
  flex-grow: 1;
}

.posttext {
  min-height: 270px;
  padding: 2rem;
  color: #555;
  font-size: 13.3333px;
  line-height: 1.3 !important;
  font-family: "Roboto";
}

.user-card {
  position: absolute;
  border: none;
  box-shadow: 2px 2px 16px rgba(0,0,0,0.2);
  width: 200px;
  height: 512px;
  z-index: 10;
  background-color: #fff;
  background-position: top center;
  background-repeat: repeat;
  left: 0;
  top: 0px;
  opacity: 0.0;
  transition: all ease-in 0.2s;
  pointer-events: none;
  padding-top: 0px;
  overflow: hidden;
  top: -16px;
  padding-top: 16px;
  left: -29px;
  width: 256px;
  box-sizing: border-box;
}

.user-card-header {
  padding: 0 !important;
  padding-left: 29px !important;
  padding-right: 28px !important;
  margin-left: 0px;
  margin-right: 0px;
  margin-top: 1.0rem;
  backdrop-filter: blur(4px);
  background-color: rgba(34,34,34,0.3);
}

.inner {
  padding: 1.5rem;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  transition: all linear 0.3s;
  color: #fff;
}

.userlevel {
  display: inline-block;
  font-size: 0.5rem;
  border-radius: 3px;
  padding: 1px 4px;
  position: relative;
  top: -5px;
  left: 5px;
  color: rgba(255,255,255,0.4);
  background-color: rgba(0,0,0,0.4);
  color: #c7e6ff;
  background-color: #2196F3;
}

.user-card-toolbar {
  position: absolute;
  left: 0px;
  bottom: 0px;
  right: 0px;
  background-color: rgba(34,34,34,0.3);
  font-size: 10px;
  display: flex;
  backdrop-filter: blur(4px);
}

.user-card-toolbar-text {
  color: #fff;
  flex-grow: 1;
  text-align: center;
  padding: 0.5rem;
}

.user-card-toolbar-header {
  display: block;
  opacity: 0.5;
}

.postuser:hover .user-card {
  display: block;
  opacity: 1.0;
  pointer-events: all;
  transition: all ease-out 0.3s;
}

.posterinfo {
  padding-bottom: 1rem;
  z-index: 3;
  position: relative;
}

.postavatar {
  margin-top: 1rem;
  text-align: center;
  line-height: 0;
}

.username {
  padding: 1.0rem;
  font-weight: bold;
}