body{
    background-image: linear-gradient(to bottom, blue, blueviolet);
    height: 100%;
    margin: 0;
    background-repeat: no-repeat;
    background-attachment: fixed;
}
.app1{
    color: yellowgreen;
    animation-name: appear;
    animation-duration: 0.4s;
}
.app2{
    color: yellowgreen;
    animation-name: appear;
    animation-duration: 0.8s;
}
.app3{
    color: yellowgreen;
    animation-name: appear;
    animation-duration: 1.2s;
}
.app4{
    color: yellowgreen;
    animation-name: appear;
    animation-duration: 1.6s;
}
@keyframes appear{
    from{color:blue}
    to{color: yellowgreen;}
}
.table-active{
    background-color: blueviolet;
    color: white;
}
.table-content{
    color: white !important;
}
h1{
    font-size: 10vmin;
}
.images{
    position: relative;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-evenly;
}
.image{
    width: 100vw;
    max-width: 100%;
    height: auto;
    display: block;
}
.overlay {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
    opacity: 0;
    transition: .5s ease;
    background-color: rgba(138,43,226,0.4);
}

.images:hover .overlay {
    opacity: 1.0;
}

.text {
    font-weight: bold;
    color: white;
    font-size: 6vmin;
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    text-align: center;
}