:root {
    --input-padding-x: .75rem;
    --input-padding-y: .75rem;

}

html,
body {
    height: 100%;
}

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

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

.form-group > input,
.form-group > label {
    padding: var(--input-padding-y) var(--input-padding-x);
}

.form-group > label {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    margin-bottom: 0; /* Override default `<label>` margin */
    line-height: 1.5;
    color: #495057;
    border: 1px solid transparent;
    border-radius: .25rem;
    transition: all .1s ease-in-out;
}

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

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

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

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

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

select.form-control:not([size]):not([multiple]) {
    height: auto;
    padding: var(--input-padding-y) var(--input-padding-x);
}

.form-group input:not(:placeholder-shown), .form-group select:not(:placeholder-shown), .form-group textarea:not(:placeholder-shown) {
    padding-top: calc(var(--input-padding-y) + var(--input-padding-y) * (2 / 3));
    padding-bottom: calc(var(--input-padding-y) / 3);

}

.form-group input:not(:placeholder-shown) ~ label, .form-group select:not(:placeholder-shown) ~ label, .form-group textarea:not(:placeholder-shown) ~ label {
    padding-top: calc(var(--input-padding-y) / 3);
    padding-bottom: calc(var(--input-padding-y) / 3);
    font-size: 11px;
    color: #777;
}

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

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

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

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