.button {
    background-color: #04AA6D; /* Green */
    border: none;
    color: white;
    padding: 4px 10px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    transition-duration: 0.4s;
    cursor: pointer;
    border-radius: 4px;
}

.green {
    background-color: white; 
    color: black; 
    border: 2px solid #04AA6D;
}

.green:hover {
    background-color: #04AA6D;
    color: white;
}

.blue {
    background-color: white; 
    color: black; 
    border: 2px solid #008CBA;
}

.blue:hover {
    background-color: #008CBA;
    color: white;
}

.red {
    background-color: white; 
    color: black; 
    border: 2px solid #f44336;
}

.red:hover {
    background-color: #f44336;
    color: white;
}

.gray {
    background-color: white;
    color: black;
    border: 2px solid #e7e7e7;
}

.gray:hover {background-color: #e7e7e7;}

.black {
    background-color: white;
    color: black;
    border: 2px solid #555555;
}

.black:hover {
    background-color: #555555;
    color: white;
}