* {
    margin: 0;
    box-sizing: border-box;
  }
  
  html {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans",
      "Helvetica Neue", sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: #1f2d3d;
  }
  
  body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100vh;
    margin: 0 auto;
    background-color: #8AAAE5;
  }
  
  body::after {
    content: "@yejinc";
    display: block;
    margin-top: 50px;
    color: #1f2d3d;
    font-size: 12px;
    font-weight: 600;
  }
  
  .feed {
    width: 100%;
    max-width: 420px;
    background-color: #FEFEFE;
    box-shadow: 0 2px 20px 0 rgba(0, 0, 0, 0.04);
    padding: 16px 20px;
    border-radius: 5px;
  }
  
  .feed button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    font-size: 14px;
    color: #0257c7;
    cursor: pointer;
  }
  
  .feed button:hover,
  .feed button:focus {
    outline: none;
    box-shadow: none;
  }
  
  .feed-user-profile {
    position: relative;
    display: flex;
    align-items: flex-end;
    width: 100%;
    margin-bottom: 16px;
  }
  
  .feed-user-profile > a {
    margin-right: 12px;
    line-height: 1;
  }
  
  .feed-user-profile > a img {
    width: 32px;
    height: 32px;
    border-radius: 32px;
  }
  
  .feed-user-profile div {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  
  .feed-user-profile h1 {
    margin-bottom: 0;
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    color: #212529;
  }
  
  .feed-user-profile a {
    color: inherit;
    text-decoration: none;
  }
  
  .feed-user-profile a:hover {
    opacity: 0.5;
  }
  
  .feed-user-profile span {
    color: #80868e;
    font-size: 12px;
    line-height: 16px;
  }
  
  .feed-user-profile button {
    position: absolute;
    top: 50%;
    right: 16px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    height: 32px;
    padding: 0 16px;
    border: 1px solid #dbdee4;
    border-radius: 4px;
    transform: translateY(-50%);
    transition: color 300ms, background-color 400ms, border-color 300ms;
  }
  
  .feed-user-profile button.following {
    background-color: #006ffe;
    border-color: #006ffe;
    color: #fff;
  }
  
  .feed-content {
    margin-bottom: 8px;
  }
  
  .feed-content p {
    font-size: 16px;
    line-height: 1.375;
    letter-spacing: -0.01em;
    color: #333e47;
  }
  
  .feed-footer button {
    height: 32px;
    padding: 0;
    border: none;
    margin-right: 12px;
    color: #0081ff;
    background-color: #fff;
  }
  
  .feed-footer button:hover {
    color: #006ffe;
  }
  
  .feed-footer button:first-child.active {
    font-weight: 700;
  }
  
  .feed-comment {
    display: none;
    margin-top: 4px;
  }
  
  .feed-comment.active {
    display: block;
  }
  
  .feed-comment textarea {
    width: 100%;
    height: 64px;
    padding: 10px 12px;
    border: 1px solid #dbdee4;
    border-radius: 3px;
    margin-bottom: 4px;
    font-size: 14px;
    line-height: 1.4285714286;
    color: #333e47;
    transition: border-color 250ms ease-in-out;
  }
  
  .feed-comment textarea:focus {
    outline: none;
    border-color: #b6bec8;
  }
  
  .feed-comment textarea::placeholder {
    color: #b6bec8;
  }
  
  .feed-comment button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    height: 32px;
    padding: 0 16px;
    border-radius: 4px;
    transition: background-color 100ms;
    background-color: #0081ff;
    border-color: #0081ff;
    color: #fff;
  }
  
  .feed-comment button:hover {
    background-color: #006ffe;
  }