index.css

.hero-section{
    background: url(bg.svg);
    background-size: fill;
    position: absolute;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 90%;
}

.title{
    position: absolute;
    top: 30%;
    left: 52%;
    transform: translate(-50%, -50%);   
    font-size: 70px;
    width: 80%;
}
button{
    cursor: pointer;
    background-color: #0066ff;
    position: relative;
    top: 40%;
    left: 33%;
    display: inline-block;
}

.bt1{
    left: 31%;
}

.bt2{
    left: 32%;
}

.bt3{
    left: 33%;
}