.bg-white {
    --bs-bg-opacity: 1;
    background-color: rgb(239, 239, 239);
    border-color: gray;
}
.btn-light {
    --bs-btn-color: #000;
    --bs-btn-bg: #f8f9fa;
    --bs-btn-border-color: #f8f9fa;
    --bs-btn-hover-color: #000;
    --bs-btn-hover-bg: #d3d4d5;
    --bs-btn-hover-border-color: #c6c7c8;
    --bs-btn-focus-shadow-rgb: 211, 212, 213;
    --bs-btn-active-color: #000;
    --bs-btn-active-bg: #c6c7c8;
    --bs-btn-active-border-color: #babbbc;
    --bs-btn-active-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
    --bs-btn-disabled-color: #000;
    --bs-btn-disabled-bg: #f8f9fa;
    --bs-btn-disabled-border-color: #f8f9fa;
}
.btn {
    margin-top: 5px;
    --bs-btn-padding-x: 0.75rem;
    --bs-btn-padding-y: 0.375rem;
    --bs-btn-font-family: ;
    --bs-btn-font-size: 1rem;
    --bs-btn-font-weight: 400;
    --bs-btn-line-height: 1.5;
    --bs-btn-color: #212529;
    --bs-btn-bg: transparent;
    --bs-btn-border-width: 1px;
    --bs-btn-border-color: transparent;
    --bs-btn-border-radius: 0.375rem;
    --bs-btn-hover-border-color: transparent;
    --bs-btn-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 1px 1px rgba(0, 0, 0, 0.075);
    --bs-btn-disabled-opacity: 0.65;
    --bs-btn-focus-box-shadow: 0 0 0 0.25rem rgba(var(--bs-btn-focus-shadow-rgb), .5);
    display: inline-block;
    padding: var(--bs-btn-padding-y) var(--bs-btn-padding-x);
    font-family: var(--bs-btn-font-family);
    font-size: var(--bs-btn-font-size);
    font-weight: var(--bs-btn-font-weight);
    line-height: var(--bs-btn-line-height);
    color: var(--bs-btn-color);
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    border: var(--bs-btn-border-width) solid var(--bs-btn-border-color);
    border-radius: var(--bs-btn-border-radius);
    transition: color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out, box-shadow .15s ease-in-out;
}

html, body {
     margin: 0;
     padding: 0;
     height: 100%;
 }
body {
    display: flex;
    flex-direction: column;
}
.content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}
.user_pw_form {
    flex: 1;
    display: flex;
    align-items: center;
    flex-direction: column;
}
.footer {
    text-align: center;
    padding: 20px 0;
}