* {
    box-sizing: border-box;
}
body {
    background-color: #000;
}
p, h3 {
  font-size: 1.5em;
  background-color: rgba(245, 238, 238, 0.7);
  color: #000;
  padding: .5em;
  line-height: 1.15;
}

/* begin side navigation styles */
footer {
  margin-top: 60vh;
  font-family: 'Allura', cursive;
  color: rgba(240, 31, 230, 0.383);
}
.burger {
  font-size:40px;
  cursor:pointer;
  margin-right: 3em;
}

.post {
  font-family: 'Allura', cursive;
  font-size: 2em;
  pad: 1em;
  color: fuchsia;
}

.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #111;
  font-family: 'Noto Sans TC', sans-serif;
  font-size: 1.5em;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
  text-align:center;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;

}

.sidenav a:hover{
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

/* end side navigation */

.textbox {
  display: block;
  margin: 1em auto;
  max-width: 90%;
  border-radius: 8px;
}
.container {
  display: block;
  margin: 1em auto;
  width: 80vw;
  align-content: center;
}
.header {
  color:#fff;
 margin: 1em auto;
 font-size: 3em;
 font-family: 'Allura', cursive;
}
.gray {
    filter: grayscale(65%);  
    border-radius: 10px;
}
.bloom {
    filter: blur(3px);
    filter: hue-rotate(30deg);
    border-radius: 10px;
}
.glow {
    filter: invert(70%);
    border-radius: 10px;
}
.row {
    display: flex;
    flex-wrap: wrap;
    padding: 0 4px;
 
   
  }

  
  /* Create four equal columns that sits next to each other */
  .column {
    flex: 25%;
    max-width: 25%;
    padding: 0 4px;
  }
  
  .column img {
    margin: 8px 2px;
    vertical-align: middle;
    width: 100%;
  }

  /* flip card styles */
  .flip-card {
    background-color: transparent;
    width: 100%;
    height: 300px;
    perspective: 1000px;
  }
  
  .flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
  }
  
  .flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
  }
  
  .flip-card-front, .flip-card-back {
    border-radius: 10px;
    position: absolute;
    width: 100%;
    height: 95%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }
  
  .flip-card-front {
    background-color: #bbb;
    color: black;
  }
  
  .flip-card-back {
    background-color: rgba(0,0,0,0.7);
    font-family: 'Noto Sans TC', sans-serif;
    font-size: 1em;
    color: whitesmoke;
   transform: rotateY(180deg);
  }
  
  /* Responsive layout - makes a two column-layout instead of four columns */
  @media screen and (max-width: 1000px) {
    .column {
      flex: 50%;
      max-width: 50%;
    }
  }
  
  /* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
  @media screen and (max-width: 600px) {
    .column {
      flex: 100%;
      max-width: 100%;
    }
    .header {
      font-size: 20px;
    }
    .burger {
      font-size:30px;
      cursor:pointer;
      margin-right: 1em;
    }
  }
/* side nav responsive */
  @media screen and (max-height: 450px) {
    .sidenav {padding-top: 15px;}
    .sidenav a {font-size: 18px;}
  }