style.css

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial;
}


.backgroundContainer {
    background: url('003-C3140COMPRESSED.jpg');
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: 100%;
    height: 93%;
}


.header {

    background-color: white;
    position: fixed;
    left: 1%;
    top: 1%;
    width: 98%;
    border-radius: 25px;
    z-index: 1;

}

.all-btn {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    background-color: white;
    border: none;
    color: black;
    cursor: pointer;
    font-size: 100%;
}

.some-btn {
    position: absolute;
    left: 40%;
    top: 50%;
    transform: translateY(-50%);
    background-color: white;
    border: none;
    color: black;
    cursor: pointer;
    font-size: 150%;

}

.home a {
    text-align: left;
    font-size: 30px;
    margin-left: 5%;
    color: black;
    text-decoration: none;
}

.row {
    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 {
    -ms-flex: 33%; /* IE10 */
    flex: 33%;
    max-width: 33%;
    padding: 0 4px;
}

.column img {
    margin-top: 20px;
    vertical-align: middle;
}

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

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

.myImg:hover {opacity: 0.7;}

/* The Modal (background) */
.modal {
    display: none;
    position: fixed; /* Stay in place */
    z-index: 1;
    padding-top: 100px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}

/* Modal Content (Image) */
.modal-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
}

/* Caption of Modal Image (Image Text) - Same Width as the Image */
#caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
    height: 150px;
}

/* Add Animation - Zoom in the Modal */
.modal-content, #caption {
    -webkit-animation-name: zoom;
    -webkit-animation-duration: 0.6s;
    animation-name: zoom;
    animation-duration: 0.6s;
}

@-webkit-keyframes zoom {
    from {-webkit-transform:scale(0)}
    to {-webkit-transform:scale(1)}
}

@keyframes zoom {
    from {transform:scale(0)}
    to {transform:scale(1)}
}

/* The Close Button */
.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
}

.close:hover,
.close:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 700px){
    .modal-content {
        width: 100%;
    }
}

img {
    opacity: 1;
    transition: opacity 0.3s;
}

img[data-src] {
    opacity: 0;
}