.input-group,
.input-group-prepend {
    display: -webkit-box;
    display: -ms-flexbox;
}
.form-control,
.input-group-text {
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
}
.form-group {
    margin-bottom: 1rem;
}
.form-group > label {
    font-weight: 600;
}
.input-group {
    position: relative;
    display: flex;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-box-align: stretch;
    -ms-flex-align: stretch;
    align-items: stretch;
    width: 100%;
}
.input-group > .form-control {
    position: relative;
    -webkit-box-flex: 1;
    -ms-flex: 1 1 auto;
    flex: 1 1 auto;
    width: 1%;
    margin-bottom: 0;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    height: 38px;
}
.input-group-prepend {
    margin-right: -1px;
    display: flex;
}
.input-group-text {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    margin-bottom: 0;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    background-color: #e9ecef;
    border: 1px solid #ced4da;
    border-radius: 0.25rem 0 0 0.25rem;
    height: 38px;
}
.form-control {
    display: block;
    width: 100%;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.dropdown-menu,.nav-item {
    padding-bottom: 0.5em;
}
.navbar-nav {
    display: flex;
    align-items: center;
    padding-top: 2.5rem;
}
.nav-item {
    min-height: 38px;
    padding-top: 0.5em;
}
table,td,th {
    border: 1px solid;
    border-collapse: collapse;
    text-align: left;
    vertical-align: top;
    padding: 5px;
}
.responsive-iframe {
    position: relative;
    min-width: 400px;
    min-height: 300px;
    align-items: center;
}
.ytplayer {
    align-items: center;
}