style.css

*{
    text-decoration: none !important;
}
footer{
    width: 100%;
    height: 65vh;
    background-color: #333;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
}
main{
    width: 100%;
    height: 35vh;
    background-color: aqua;
}
.footer_div1{
    width: 95%;
    height: 50vh;
    background-color: aquamarine;
}
.footer_div2{
    width: 95%;
    height: 15vh;
    background-color: blueviolet;
}
#ul1{
   
    list-style: none;
}

#ul1>li{
    display: inline-flex;
    margin-right: 20px;
    width: 50px;
    height: 50px;
    background-color: gray;
    border-radius: 10px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
   
}
#ul1>li>a{
    color: white;
}
#btn1{
    width: 250px;
    height: 45px;
    border-radius: 5px;
    background: none;
    border: 2px dashed hsla(0, 0%, 85%, .2);
    color: white;
}
.accordion{
    width: 100%;
    height: 25vh;
    background-color: green;
}
@media screen and (max-width: 992px) {
    .div2,.div3,.div4{
        display: none;
    }
    .divyellow{
        order: 2 ;
    }
    .divred{
        justify-content: flex-start !important;
    }
}

@media screen and (min-width: 992px) {
    .accordion{
        display: none;
    }
}