*{
    margin:0;
    padding:0;
    font-family: "Poppins", sans-serif;
}
#banner{
    background:linear-gradient(rgba(0,0,0,0.5),#009688),url(images/banner.jpg);
    background-size:cover;
    background-position:center;
    height:100vh;
}
.logo{
    width:140px;
    position:absolute;
    top:4%;
    left:10%;
}
.banner-text{
    text-align:center;
    color:#fff;
    padding-top:180px;
}
.banner-text h1{
    font-size:100px;
    font-family:"Kaushan Scripts", cursive;
}
.banner-text p{
    font-size:20px;
    font-style:italic;
}
.banner-btn{
    margin:70px auto;
}
.banner-btn a{
    width:150px;
    text-decoration:none;
    display:inline-block;
    margin:0 10px;
    padding:12px 0;
    color:#fff;
    border:.5px solid #fff;
    position:relative;
    z-index:1;
    transition:color 0.5s;
}
.banner-btn a span{
    width:0;
    height:100%;
    position:absolute;
    top:0;
    left:0;
    background:#fff;
    z-index:-1;
    transition:0.5s;
}
.banner-btn a:hover span{
    width:100%;
}
.banner-btn a:hover{
    color:#000;
}
#sideNav{
    width:225px;
    height:100vh;
    position:fixed;
    right:-225px;
    top:0;
    background:#009688;
    z-index:2;
    transition:0.5s;
}
nav ul li{
    list-style:none;
    margin:50px 20px;
}
nav ul li a{
    text-decoration:none;
    color:#fff;
}
#menuBtn{
    width:50px;
    height:50px;
    background:#009688;
    text-align:center;
    position:fixed;
    right:30px;
    top:20px;
    border-radius:3px;
    z-index:3;
    cursor:pointer;
}
#menuBtn img{
    width:20px;
    margin-top:15px;
}
@media screen and (max-width:770px){
    .banner-text h1{
    font-size:40px;
    }
    .banner-btn a{
        display:block;
        margin:20px auto;
    }
}
/*--features--*/
#features{
    width:100%;
    padding:70px 0;
}
.title-text{
    text-align:center;
    padding-bottom:70px;
}
.title-text p{
    margin:auto;
    font-size:20px;
    color:#009688;
    font-weight:bold;
    position:relative;
    z-index:1;
    display:inline-block;
}
.title-text p::after{
    content:'';
    width:50px;
    height:35px;
    background:linear-gradient(#019587,#fff);
    position:absolute;
    top:-20px;
    left:0;
    z-index:-1;
    transform:rotate(10deg);
    border-top-left-radius:35px;
    border-bottom-right-radius:35px;
}
.title-text h1{
    font-size:50px;
    font-weight:bold;
}
.feature-box{
    width:80%;
    margin:auto;
    display:flex;
    flex-wrap:wrap;
    align-item:center;
    text-align:center;
}
.features{
    flex-basis:50%;
}
.features-img{
    flex-basis:50%;
    margin:auto;
}
.features-img img{
    width:70%;
    border-radius:10px
}
.features h1{
    text-align:left;
    margin-bottom:10px;
    font-weight:100;
    color:#009688;
}
.features-desc{
    display:flex;
    align-items:center;
    margin-bottom:40px;
}
.feature-icon .fa-solid{
    width:50px;
    height:50px;
    font-size:30px;
    line-height:50px;
    border-radius:8px;
    color:#009688;
    border:1px solid #009688;
}
.feature-text p{
    padding:0 20px;
    text-align:initial;
}
@media screen and (max-width:770px){
    .title-text h1{
        font-size:35px;
    }
    .features{
        flex-basis:100%;
    }
    .features-img{
        flex-basis:100%;
    }
    .features.img img{
        width:100%;
    }
}
/*--service--*/
#service{
    width:100%;
    padding:70px 0;
    background:#efefef;
}
.service-box{
    width:80%;
    display:flex;
    flex-wrap:wrap;
    justify-content:space-around;
    margin:auto;
}
.single-service{
    flex-basis:48%;
    text-align:center;
    border-radius:7px;
    margin-bottom:20px;
    color:#fff;
}
.single-service img{
    width:100%;
    border-radius:7px;
}
.overlay{
    width:100%;
    height:100%;
    position:absolute;
    top:0;
    border-radius:7px;
    cursor:pointer;
    background:linear-gradient(rgba(0,0,0,0.5),#009688);
    opacity:0;
    transition:1s;
}
.single-service:hover .overlay{
    opacity:1;
}
.single-service {
    position: relative;
    text-align: center;
}

.overlay {
    position: absolute;
    bottom: 0;
    background: linear-gradient(rgba(0, 0, 0, 0.6),#009688);
    width: 100%;
    opacity: 0;
    transition: 0.5s;
}

.single-service:hover .overlay {
    opacity: 1;
}
.service-desc{
    width:80%;
    position:absolute;
    bottom:0;
    left:50%;
    opacity:0;
    transform:translateX(-50%);
    transition:1s;
}
hr{
    background:#fff;
    height:2px;
    border:0;
    margin:15px auto;
    width:60%;
}
.service-desc p{
    font-size:14px;
}
.single-service:hover .service-desc{
    bottom:40%;
    opacity:1;
}
@media screen and (max-width:770px){
    .single-service{
        flex-basis:100%;
        margin-bottom:30px;
    }
    .service-desc p{
    font-size:12px;
        }
        hr{
            margin:5px auto;
        }
        .single-service:hover .service-desc{
            bottom:25% !important;
}
}
/*---testimonial---*/
#testimonial{
    width:100%;
    padding:70px 0;
}
.testimonial-row{
    width:80%;
    margin:auto;
    display:flex;
    justify-content:space-between;
    align-items:flex-start;
    flex-wrap:wrap;
}
.testimonial-col{
    flex-basis:28%;
    padding:10px;
    margin-bottom:30px;
    border-radius:5px;
    box-shadow:0 10px 20px 3px #00968814;
    cursor:pointer;
    transition:transform .5s;
}
.testimonial-col p{
    font-size:14px;
}
.user{
    display:flex;
    align-items:center;
    margin:20px 0;
}
.user img{
    width:40px;
    margin-right:20px;
    border-radius:3px;
}
.user-info .fa-brands{
    margin-left:10px;
    color:#27c0ff;
    font-size:20px;
}
.user-info small{
    color:#009688;
}
.testimonial-col:hover{
    transform:translateY(-7px);
}
@media screen and (max-width:770px){
    .testimonial-col{
        flex-basis:100%;
    }
}

/*--footer--*/
#footer{
    padding:100px 0 20px;
    background:#efefef;
    position:relative;
}
.footer-row{
    width:80%;
    margin:0 auto;
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
}
.footer-left, .footer-right{
    flex-basis:45%;
    padding:10px;
    margin-bottom:20px;
}
.footer-right{
    text-align:right;
}
.footer-row h1{
    margin:10px;
}
.footer-row p{
    line-height:35px;
}
.footer-left .fa, .footer-right .fa{
    font-size:20px;
    margin:10px;
}
.footer-right .fa-brands{
    color:#7360f2;
}
.footer-img{
    max-width:370px;
    opacity:0.1;
    position:absolute;
    left:50%;
    top:35%;
    transform:translate(-50%,-50%);
}
.social-links{
    text-align:center;
}
.social-links .fa-brands{
    height:40px;
    width:40px;
    font-size:20px;
    line-height:40px;
    border:1px solid #009688;
    margin:40px 5px 0;
    color:#009688;
    cursor:pointer;
    transition:.5s;
}
.social-links .fa-brands:hover{
    background:#009688;
    color:#fff;
    transform:translateY(-7px);
}
.social-links p{
    font-size:12px;
    margin-top:20px;
}
@media screen and (max-width:770px){
    .footer-left, .footer-right{
        flex-basis:100%;
        font-size:14px;
    }
    .footer-img{
        top:25%;
    }
}
<style>
    .service-box {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
        justify-content: center;
    }

    @media screen and (max-width: 770px) {
        .service-box {
            grid-template-columns: repeat(1, 1fr);
        }
    }
</style>