.ax {
	background-color: silver;
    color:  	#191970;
    padding: 5px 20px;
    border-radius: 7px;
    text-align: center; 
    display: inline-block;
    text-decoration: none;
}

.ax:hover {
color: silver;
    background-color:  	#191970;
}

.ay {
	background-color:  	#C71585;
    color: #DDA0DD;
    padding: 5px 20px;
    border-radius: 7px;
    text-align: center; 
    display: inline-block;
    text-decoration: none;
}

.ay:hover {
color:  	#C71585;
    background-color: #DDA0DD;
}

.home {
	background-color:  	green;
    color: 	#32CD32;
    padding: 5px 20px;
    border-radius: 7px;
    text-align: center; 
    text-decoration:none;
    text-decoration-color: red;
    text-transform: uppercase;
}

.home:hover {
color: green;
    background-color: 	#32CD32;
}

#center{
margin:200 auto;
}
p{
font-family: Arial;
font-size: 12;
color: #000;
}
h4{
font-family: Arial;
font-size: 14;
}
.b{
font-family: Arial;
font-size: 14;
color: #191970;
}

.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted black;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #555 transparent transparent transparent;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}