body{
    display: flex;
    min-height: 100vh;
    background-color: #E6E6FA;
}
#c-slider{
    margin: auto;
    width: 90%;
    max-width: 900px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 0 10px #fff,
                0 15px 50px;

}

#slider{
    display:flex;
    width: 500%;
}

section{
    width: 100%;
}

#slider img {
    display: block;
    width: 100%;
    height: 100%;
}
#btn-prev, #btn-next {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.7);
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    line-height: 40px;
    font-size: 25px;
    font-weight: bold;
    text-align: center;
    border-radius: 50%;
    font-family: monospace;
    cursor: pointer;
}
#btn-prev:hover, #btn-next:hover {
    background: rgba(255, 255, 255, 1);
}
#btn-prev {
    left: 10px;
}
#btn-next {
    right: 10px;
}