fieldset {
    width: 30%;
    background-color: forestgreen;
    margin: auto;
    margin-top: 100px;
}
label {
    clear: left;
    float: left;
    width: 10em;
    text-align: right;
    margin-right: .5em;
}
input {
    float: left;
    background-color: skyblue;
}
button {
    float: left;
    clear: both;
    margin-left: 7em;
    margin-top: 1em;
    background-color: darkgreen;
    color: #FFFFFF;
}