body{
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
}

body div {
    box-sizing: border-box;
}

/*------------Style used in <header>----------*/
.hero-image-box {
    height: 35vw;
    width: 100vw;
    position: relative;
    overflow: hidden;
    
}

.hero-image {
    width: 100vw;
    height: auto;
    position: relative;
}

.hero-text {
    text-align: center;
    position: absolute;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
    color:white;
    text-shadow: 2px 2px 5px black;
}

.hero-text h1 {
    font-size: 9vw;
}

.hero-text h2 {
    font-size: 2vw;
}

.picture_discribe{
    position: absolute;
    bottom: 10px;
    right: 10px;
    font-size: 1vw;
    color: white;
}

.navbar {
    overflow: hidden;
    background-color: #333;
    position: fixed;
    width: 100%;
    z-index: 1;
}

.navbar a {
    float: left;
    font-size: 20px;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

.dropbtn_box{
    float: left;
    overflow: hidden;
}

.dropbtn {
    font-size: 20px;  
    border: none;
    outline: none;
    color: white;
    padding: 14px 16px;
    background-color: #333;
    margin: 0;
}

.dropdown_box {
    display: none;
    position: fixed;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 2; 
}

.dropdown_box a {
    float: none;
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropbtn_box:hover .dropdown_box {
    display: block;
}

.navbar a:hover, .dropbtn:hover {
    background-color: red;
}

.dropdown_box a:hover {
    background-color: #ddd;
}

.active_page {
    background-color:goldenrod;
}

.searchicon {
    float: right;
    background-color: inherit;
    padding: 6px;
    margin-top: 8px;
    margin-right: 16px;
    border: none;
    font-size: 17px;
    width: 20px;
}

.navbar input[type=text] {
    float: right;
    padding: 6px;
    margin-top: 8px;
    margin-right: 16px;
    border: none;
    font-size: 17px;
    border: 1px solid #ccc; 
  }


  .filter_white{
    filter: brightness(0) invert(1);
  }
/*------------Style used in <header>----------*/


/*------------Style used in gallery-----------*/
  .gallery_row {
      margin-top: 20px;
      margin-left: 5vw;
      margin-right: 5vw;
      background-color: white;
      height: auto;
      text-align: center;
  }

  @media screen and (min-width: 1008px){
    .gallery_unit {
        margin-left: calc(10vw/8);
        margin-right: calc(10vw/8);
        margin-bottom: 30px;
        height: 25vw;
        width: 20vw;
        float: left;
        border: 1px solid darkgray;
        overflow: hidden;
        position: relative;
    }
    
    .gallery_unit .title {
        font-size: 2vw;
    }
  }

  @media screen and (min-width: 641px) and (max-width: 1007px) {
    .gallery_unit {
        margin-left: calc(15vw/6);
        margin-right: calc(15vw/6);
        margin-bottom: 30px;
        height: 30vw;
        width: 25vw;
        float: left;
        border: 1px solid darkgray;
        overflow: hidden;
        position: relative;
    }    
    .gallery_unit .title {
        font-size: 2.5vw;
    }
  }

  @media screen and (max-width: 640px) {
    .gallery_unit {
        margin-left: calc(30vw/4);
        margin-right: calc(30vw/4);
        margin-bottom: 30px;
        height: 35vw;
        width: 30vw;
        float: left;
        border: 1px solid darkgray;
        overflow: hidden;
        position: relative;
    }
    .gallery_unit .title {
        font-size: 3vw;
    }
  }
  
  .gallery_unit:hover {
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    border: 1px solid black;
  }

  .gallery_unit img {
      width: auto;
      height: 70%;
  }

  .gallery_unit .info {
    color: gray;
    font-size: 15px;
    position: absolute;
    bottom: 10px;
    right: 10px;
}