#myBtn {
    display: none; /* Hidden by default */
    position: fixed; /* Fixed/sticky position */
    bottom: 20px; /* Place the button at the bottom of the page */
    right: 30px; /* Place the button 30px from the right */
    z-index: 99; /* Make sure it does not overlap */
    border: none; /* Remove borders */
    outline: none; /* Remove outline */
    background-color: red; /* Set a background color */
    color: white; /* Text color */
    cursor: pointer; /* Add a mouse pointer on hover */
    padding: 15px; /* Some padding */
    border-radius: 10px; /* Rounded corners */
    font-size: 18px; /* Increase font size */
  }

#myBtn:hover {
  background-color: #555; /* Add a dark-grey background on hover */
}

/* Make the image fully responsive */
.carousel-inner img {
  width: 100%;
  height: 100%;
  opacity: .7;
}

.container .text-block {
    position: absolute;
    bottom: 30%;
    /*background-color: black;*/
    /*background: rgb(0, 0, 0);  Fallback color */
    /*background: rgba(0, 0, 0, 1);  Black background with 0.5 opacity */
    color: white;
    /*width: 100%;*/
    /*padding: 20px;*/
    /*                padding-left: 20px;
    padding-right: 20px;*/
    }

footer {
    position: inherit;
    bottom: 0;
    width: 100%;
}

/* START Picture Row */
.row_pic {
  display: -ms-flexbox; /* IE10 */
  display: flex;
  -ms-flex-wrap: wrap; /* IE10 */
  flex-wrap: wrap;
  padding: 0 4px;
}

/* Create four equal columns that sits next to each other */
.column_pic {
  -ms-flex: 25%; /* IE10 */
  flex: 25%;
  max-width: 25%;
  padding: 0 4px;
}

.column_pic img {
  margin-top: 8px;
  vertical-align: middle;
  width: 100%;
}

/* Responsive layout - makes a two column-layout instead of four columns */
@media screen and (max-width: 800px) {
  .column_pic {
    -ms-flex: 50%;
    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_pic {
    -ms-flex: 100%;
    flex: 100%;
    max-width: 100%;
  }
}
/* END Picture Row */


/* START pic modal */
/* Style the Image Used to Trigger the Modal */
.view_img {
  border-radius: 5px;
  cursor: pointer;
  transition: 0.3s;
}

.view_img:hover {opacity: 0.7;}

.center-cropped {
  width: 100px;
  height: 100px;
  background-position: center center;
  background-repeat: no-repeat;
  overflow: hidden;
}

/* Set the image to fill its parent and make transparent */
.center-cropped img {
  min-height: 100%;
  min-width: 100%;
  /* IE 8 */
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
  /* IE 5-7 */
  filter: alpha(opacity=0);
  /* modern browsers */
  opacity: 0;
}

/* END pic modal */