Why does my custom modal display on every page?

Good day! I found a custom modal in codepen however I want it to appear only once but everytime I access different pages on my store it keeps popping up, Maybe there are some changes that I need to do in this code, Hope you can help me, THANKYOU!

CSS

.img-replace {
/* replace text with an image */
display: inline-block;
overflow: hidden;
text-indent: 100%;
color: transparent;
white-space: nowrap;
}
.bts-popup {
position: fixed;
left: 0;
top: 0;
height: 100%;
width: 100%;
background-color: rgba(0, 0, 0, 0.5);
opacity: 0;
visibility: hidden;
-webkit-transition: opacity 0.3s 0s, visibility 0s 0.3s;
-moz-transition: opacity 0.3s 0s, visibility 0s 0.3s;
transition: opacity 0.3s 0s, visibility 0s 0.3s;
}
.bts-popup.is-visible {
opacity: 1;
visibility: visible;
-webkit-transition: opacity 0.3s 0s, visibility 0s 0s;
-moz-transition: opacity 0.3s 0s, visibility 0s 0s;
transition: opacity 0.3s 0s, visibility 0s 0s;
}

.bts-popup-container {
position: relative;
width: 90%;
max-width: 400px;
margin: 4em auto;
background: #f36f21;
border-radius: none;
text-align: center;
box-shadow: 0 0 2px rgba(0, 0, 0, 0.2);
-webkit-transform: translateY(-40px);
-moz-transform: translateY(-40px);
-ms-transform: translateY(-40px);
-o-transform: translateY(-40px);
transform: translateY(-40px);
/* Force Hardware Acceleration in WebKit */
-webkit-backface-visibility: hidden;
-webkit-transition-property: -webkit-transform;
-moz-transition-property: -moz-transform;
transition-property: transform;
-webkit-transition-duration: 0.3s;
-moz-transition-duration: 0.3s;
transition-duration: 0.3s;
}
.bts-popup-container img {
padding: 20px 0 0 0;
}
.bts-popup-container p {
color: white;
padding: 10px 40px;
}
.bts-popup-container .bts-popup-button {
padding: 5px 25px;
border: 2px solid white;
display: inline-block;
margin-bottom: 10px;
}

.bts-popup-container a {
color: white;
text-decoration: none;
text-transform: uppercase;
}

.bts-popup-container .bts-popup-close {
position: absolute;
top: 8px;
right: 8px;
width: 30px;
height: 30px;
}
.bts-popup-container .bts-popup-close::before, .bts-popup-container .bts-popup-close::after {
content: ‘’;
position: absolute;
top: 12px;
width: 16px;
height: 3px;
background-color: white;
}
.bts-popup-container .bts-popup-close::before {
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
left: 8px;
}
.bts-popup-container .bts-popup-close::after {
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
right: 6px;
top: 13px;
}
.is-visible .bts-popup-container {
-webkit-transform: translateY(0);
-moz-transform: translateY(0);
-ms-transform: translateY(0);
-o-transform: translateY(0);
transform: translateY(0);
}
@media only screen and (min-width: 1170px) {
.bts-popup-container {
margin: 8em auto;
}
}

JAVASCRIPT

jQuery(document).ready(function($){

window.onload = function (){
$(“.bts-popup”).delay(1000).addClass(‘is-visible’);
}

//open popup
$(‘.bts-popup-trigger’).on(‘click’, function(event){
event.preventDefault();
$(‘.bts-popup’).addClass(‘is-visible’);
});

//close popup
$(‘.bts-popup’).on(‘click’, function(event){
if( $(event.target).is(‘.bts-popup-close’) || $(event.target).is(‘.bts-popup’) ) {
event.preventDefault();
$(this).removeClass(‘is-visible’);
}
});
//close popup when clicking the esc keyboard button
$(document).keyup(function(event){
if(event.which==‘27’){
$(‘.bts-popup’).removeClass(‘is-visible’);
}
});
});

HTML

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