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;
    background-color: #f5f5f5;
}

.form-signin {
    width: 100%;
    max-width: 400px;
    padding: 15px;
    margin: 0 auto;
}

    .form-signin .checkbox {
        font-weight: 400;
    }

    .form-signin .form-control {
        position: relative;
        box-sizing: border-box;
        height: auto;
        padding: 10px;
        font-size: 16px;
    }

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

    .form-signin input {
        border-bottom-right-radius: 0;
        border-bottom-left-radius: 0;
    }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    clip-path: inset(50%);
    border: 0;
}

.sr-only:active, .sr-only:focus
{
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
    clip-path: none;
}