style.css

*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body{
    background-color: #ecf2f8;
    font-family:'barlow semi condensed', sans-serif;
}
#testimonial-grid-container{
    padding: 5% 3%;
}
#testimonial-1{
    background-color: #7541c8; 
    color: #FFFFFF;
    position: relative;
    z-index:0;

}
#testimonial-2{
    background-color:#48556a;
    color: #FFFFFF;
}
#testimonial-3, #testimonial-5 {
    background-color: #FFFFFF; 
    color:#48556a;
}
#testimonial-4{
    background-color: #19212e;
    color:#FFFFFF;;
}

.grid-item{
    margin-bottom: 20px;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 1px 1px 5px 1px rgb(0, 0, 0, 0, 2);
    font-size: 13px;
}
.grid-item p{
    opacity: 70%;
}
.header{
    display:flex;
    align-items: center;
    margin-bottom: 20px;
    z-index: 3;
    position: relative;
}
.header, .name{
    opacity: 100%;
    font-size: 1rem;
}
.header img{
    border-radius: 50%;
    margin-right: 10px;
    border: 1px solid #7541c8;
}
.grid-item h4{
    margin-bottom: 20px;
    font-size: 1.2rem;
    font-weight: 600;
}
#quote{
    position: absolute;
    right: 15px;
    top:0;
    z-index:1;
}

@media (min-width: 576px){
    #testimonial-grid-container,
    #main-left, 
    #top, 
    #bottom{
        display: flex;
    }
    #top, #bottom{
        flex-basis: 50%;
    
    }
    #testimonial-5{
        flex-basis: 20%;
    }
    #main-left{
        
        flex-direction: column;
        flex-basis: 80%;
    }
    #main-left .grid-item{
        margin-right: 15px;
    }
   
    
    #testimonial-1, #testimonial-4{
        flex-basis: 65%;
    }
    #testimonial-2, #testimonial-3{
        flex-basis: 35%;
    }

    #testimonial-grid-container{
        
        max-width: 1440px;
        margin: 0 auto;
        
    }
    
}