main.css

.slidebox {
    display: flex;
    flex-direction: column;
    justify-content: center;

    width: 50%;
    height: 50%;
    padding: 0;
    margin-top: 5vw;

/*    left: 50%;
    top: 55%;
    -o-transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);*/
}

.slides {
    display: none;
}

.slideImg {
    width: calc(100% - 0vw);
    height: calc(100% - 0vw);
}

.fade {
    -webkit-animation-name: fade;
    -webkit-animation-duration: 1.5s;
    -o-animation-name: fade;
    -o-animation-duration: 1.5s;
    -moz-animation-name: fade;
    -moz-animation-duration: 1.5s;
    animation-name: fade;
    animation-duration: 1.5s;
}

@-webkit-keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}

@-o-keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}

@-moz-keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}

@keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}

.prev, .next {
    cursor: pointer;
    position: absolute;
    width: auto;
    padding: 1.5vw;
    color: white;
    font-weight: bold;
    font-size: 2vw;
    transition: 0.6s ease;
    border-radius: 0 3px 3px 0;
    text-decoration: none;

}

.next {
    right: 0;
    border-radius: 3px 0 0 3px;
}

.prev {
    left: 0;
}

.prev:hover, .next:hover {
    background-color: rgb(0, 0, 0);
    background-color: rgba(0,0,0,0.8);
}