html,
body {
    height: 100%;
}

body {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #f5f5f5;
}

.form-signin {
    width: 100%;
    max-width: 420px;
    padding: 15px;
    margin: auto;
}

.form-label-group {
    position: relative;
    margin-bottom: 1rem;
}

    .form-label-group > input,
    .form-label-group > label {
        height: 3.125rem;
        padding: .75rem;
    }

    .form-label-group > label {
        position: absolute;
        top: 0;
        right: 0;
        display: block;
        width: 100%;
        margin-bottom: 0; /* Override default `<label>` margin */
        line-height: 1.5;
        color: #495057;
        pointer-events: none;
        cursor: text; /* Match the input under the label */
        border: 1px solid transparent;
        border-radius: .25rem;
        transition: all .1s ease-in-out;
    }

    .form-label-group input::-webkit-input-placeholder {
        color: transparent;
    }

    .form-label-group input:-ms-input-placeholder {
        color: transparent;
    }

    .form-label-group input::-ms-input-placeholder {
        color: transparent;
    }

    .form-label-group input::-moz-placeholder {
        color: transparent;
    }

    .form-label-group input::placeholder {
        color: transparent;
    }

    .form-label-group input:not(:placeholder-shown) {
        padding-top: 1.25rem;
        padding-bottom: .25rem;
    }

        .form-label-group input:not(:placeholder-shown) ~ label {
            padding-top: .25rem;
            padding-bottom: .25rem;
            font-size: 12px;
            color: #777;
        }

/* Fallback for Edge
-------------------------------------------------- */
@supports (-ms-ime-align: auto) {
    .form-label-group > label {
        display: none;
    }

    .form-label-group input::-ms-input-placeholder {
        color: #777;
    }
}

/* Fallback for IE
-------------------------------------------------- */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
    .form-label-group > label {
        display: none;
    }

    .form-label-group input:-ms-input-placeholder {
        color: #777;
    }
}