.background {
    background-color: #3D9970;
}
.centertext {
    text-align:center;
    color: #001f3f;
    font-size: 150%;
    font-weight: bold;
    background: white;
    font-family: "Courier New", Courier, monospace;
    transition-delay: 4s;
    transition-duration: 1s;
    transition: background 4s;
    transition: color .5s linear;
    animation-name: hoverOver;
        
}
.centertext:hover {
    background: #FF851B;
    color: white;
    animation-name: hoverOver;
    animation-duration: 5s;
    content: "hio";
        
}

.smalltext {
    text-align:center;
    color: #001f3f;
    font-size: 100%;
    font-weight: normal;
    font-style: oblique;
    font-family: "Courier New", Courier, monospace;
        
}

@keyframes hoverOver {
  0%   {content: "Choose an element" ;}
  25%  {content: "Choose an element.";}
  50%  {content: "Choose an element..";}
  100% {content: "Choose an element...";}
}

input.Button {
    cursor: pointer;
    padding: 0px;
    background-color: darkseagreen;
    height: 50px;
    width: 130px;
    top: 100px;
    display:block;
    margin-left:auto;
    margin-right:auto;
    margin-top:0.6%;
    margin-bottom:0%;
    text-align:center;
    color: #fff;
    font-size: 150%;
    font-weight: bold;

}

input.Button:hover {
    color: black;
    background-color: limegreen;
    border: 1px solid #fff;
    font-size: 170%;    
}

#Water:hover {
    background-image: url("watergif.gif");
}
#Air:hover {
    background-image: url("airgif.gif");
}
#Co2:hover {
    background-image: url("co2gif2.gif");
}


.ButtonNew {
    font-weight: bold;
    color:black;
    padding: 20px 44px;
    border-radius: 12px;
    border: 2px solid black; /* Green */
    font-family: "Courier New", Courier, monospace;
    font-size: 20px;
    letter-spacing: 2px;
    word-spacing: 2px;
    margin-left:auto;
    margin-right:auto;
    display:block;
    margin-top:1%;
    margin-bottom:0%;
    -webkit-transition-duration: 0.4s; /* Safari */
    transition-duration: 0.4s;
}

.ButtonNew:hover {
    color:white;
    border: 2px solid white; /* Green */
    font-size: 25px;
}

.ButtonNew:active {
    color:green;
}