html,
body {
    height: 100%;
}

body {
    display: -ms-flexbox;
    display: -webkit-box;
    display: flex;
    -ms-flex-align: center;
    -ms-flex-pack: center;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
    padding-top: 40px;
    padding-bottom: 40px;
}

.form-signin {
    width: 700px;
    max-width: 430px;
    padding: 15px;
    margin: 0 auto;
    margin-right: 0%;
    margin-top: 10%;
    border-radius: 8px;
    border-style: groove;
}

.form-signin .checkbox {
    font-weight: 400;
    opacity: 0.5;
    position: relative;
    margin-left: -90px;
}

.form-control {
    position: relative;
    border-style: inset;
    height: auto;
    padding: 10px;
    font-size: 15px;
}

.form-control:focus {
    z-index: 2;
}

.top {
    margin-bottom: 5px;
    border-radius: 5px;
    box-shadow: 1px 2px 1px grey;
    border-style: inset;
}

.middle {
    margin-bottom: 5px;
    border-radius: 5px;
    box-shadow: 1px 2px 1px grey;
    border-style: inset;
}

.bottom {
    margin-bottom: 5px;
    border-radius: 5px;
    box-shadow: 1px 2px 1px grey;
    border-style: inset;
}