* {
    box-sizing: border-box;
}

.row1 {
    margin: 8px -16px;
}

/* Add padding BETWEEN each column (if you want) */
.row1,
.row1 > .column1 {
    padding: 8px;
    
}

/* Create three equal columns that floats next to each other */
.column1 {
    /*float: left;*/
    /*width: 33.33%;*/
    /*margin:10px;*/
    /*margin-left:5px;
    margin-right:5px;*/
    display: none; /* Hide columns by default */
}

/* Clear floats after rows */ 
.row1:after {
    content: "";
    display: table;
    clear: both;
}

/* Content */
.content1 {
    /*background-color: white;*/
    padding: 10px;
}

/* The "show" class is added to the filtered elements */
.show1 {
    display: block;
}

/* Style the buttons */
.btn1 {
  border: none;
  outline: none;
  padding: 12px 16px;
  background-color: white;
  cursor: pointer;
}

/* Add a grey background color on mouse-over */
.btn1:hover {
  background-color: #ddd;
}

/* Add a dark background color to the active button */
.btn1.active {
  background-color: #666;
  color: white;
}
.projects_img
{
    width: 150px; 
    height: 200px;
}