html,
body {
    height: 100%;
}

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

.form-signin {
    max-width: 330px;
    padding: 15px;
}

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

.form-signin input[type="username"] {
    margin-bottom: 10px;
}

.form-signin input[type="password"] {
    margin-bottom: 10px;
}

.bd-placeholder-img {
    font-size: 1.125rem;
    text-anchor: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
}

@media (min-width: 768px) {
    .bd-placeholder-img-lg {
        font-size: 3.5rem;
    }
}

.b-example-divider {
    height: 3rem;
    background-color: rgba(0, 0, 0, .1);
    border: solid rgba(0, 0, 0, .15);
    border-width: 1px 0;
    box-shadow: inset 0 .5em 1.5em rgba(0, 0, 0, .1), inset 0 .125em .5em rgba(0, 0, 0, .15);
}

.b-example-vr {
    flex-shrink: 0;
    width: 1.5rem;
    height: 100vh;
}

.bi {
    vertical-align: -.125em;
    fill: currentColor;
}

.nav-scroller {
    position: relative;
    z-index: 2;
    height: 2.75rem;
    overflow-y: hidden;
}

.nav-scroller .nav {
    display: flex;
    flex-wrap: nowrap;
    padding-bottom: 1rem;
    margin-top: -1px;
    overflow-x: auto;
    text-align: center;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
}

.center-body {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    /****** center box
    width: 300px;
    height: 300px;
    border: solid 1px #aaa; */
}

.loader-circle-25 {
    height: 70px;
    width: 70px;
    position: relative;
    display: inline-block;
}
.loader-circle-25:after,
.loader-circle-25:before {
    content: "";
    display: inline-block;
    position: relative;
    border-radius: 50%;
    border: 5px solid #0000;
    border-left: 5px solid #ffc107;
    border-right: 5px solid #ffc107;
}
.loader-circle-25:before {
    height: 70px;
    width: 70px;
    animation: spin1 2s infinite;
}
.loader-circle-25:after {
    height: 40px;
    width: 40px;
    top: 15px;
    left: 15px;
    animation: spin2 2s infinite;
    position: absolute;
}
@keyframes spin1 {
    50% {
        transform: rotate(360deg);
    }
}
@keyframes spin2 {
    50% {
        transform: rotate(-360deg);
    }
}