Responsive media queries - css

Question

Im very confused at the moment, so im trying to create a responsive website.
For some reason my media queries are not triggering? I have the below CSS and it works fine from X-Small Below 480px and up to 575.98px. but past the media query, anything that I add into the 767.98px range isnt working at all?
#media only screen and (min-width : 480px) {
.card-4{
display: none;
}
}
#media (max-width: 575.98px) {
#about{
padding: 0 0.5rem 0 0.5rem;
}
.about-photo img{
width: 70%;
}
.about-text{
margin: auto;
text-align: center;
padding: 1rem 0 3rem 0;
}
.about-text h1, .about-text p{
text-align: center;
float: none;
}
.table{
margin: 0;
padding-left: 0;
}
.table li{
margin: auto;
padding-top: 0.3rem;
padding-left: 2rem;
text-align: left;
}
#skills-list{
margin: 0 2rem 0 2rem;
}
#skills-list li{
text-align: left;
padding-bottom: 1rem;
}
.card-1{
display: none;
}
.card{
margin-left: auto !important;
margin-right: auto !important;
text-align: center;
}
.cards-container{
margin: 0 !important;
}
.timeline > li > .timeline-panel {
width: 85%;
float: right;
padding: 1.2rem;
}
.timeline:before {
left: 6%;
}
.timeline > li > .timeline-badge {
width: 44px;
height: 44px;
left: 6%;
}
.timeline > li > .timeline-panel:before {
border-left-width: 0;
border-right-width: 15px;
left: -15px;
right: auto;
}
.timeline > li > .timeline-panel:after {
border-left-width: 0;
border-right-width: 14px;
left: -14px;
right: auto;
}
.square-1-text, .square-2-text, .square-3-text{
height: 31rem;
}
.square-1{
order:1;
}
.square-1-text{
order:2;
}
.square-2{
order:3;
}
.square-2-text{
order:4;
}
#passions-section{
padding-bottom: 0;
}
#skills-list li.i{
list-style-position: outside !important;
display: none;
}
/*// Small devices (landscape phones, less than 768px)*/
#media (max-width: 767.98px) {
}
/*// Medium devices (tablets, less than 992px)*/
#media (max-width: 991.98px) {
}
/*// Large devices (desktops, less than 1200px)*/
#media (max-width: 1199.98px) {
}

Answer 1

Using the right breakpoints in your CSS media queries is likely the most important decision when implementing a fully responsive site.
Min-width: 320px (smaller phone viewpoints)
Min-width: 480px (small devices and most phones)
Min-width: 768px (most tablets)
Min-width: 992px (smaller desktop viewpoints)
Min-width: 1200px (large devices and wide screens)
In your case Try this one
#media (min-width:500px) and (max-width:750px)