*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(-45deg, #5add5a, #333);
}
article{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    filter: blur(500px);
}
section{
    z-index: 5;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2em 5em;
    filter: drop-shadow(0px 20px 14px #444);
}
section button{
    width: 300px;
    height: 150px;
    margin: 1rem;
    background-image: var(--bci);
    background-size: contain;
    background-repeat: no-repeat;
    border: none;
    cursor: pointer;
    transition: 0.5s;
}
section:hover button:not(:hover){
    filter: blur(10px);
    transition: 0.5s;
}