:root {
    --white: #fff;
    --primary: #007bff;
    --secondary: #6c757d;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #17a2b8;
    --dark: #343a40;
    --light: #f8f9fa;
}

/* text color */
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-info { color: var(--info); }
.text-dark { color: var(--dark); }
.text-light { color: var(--light); }


/* bg-colors */
.bg-primary { background-color: var(--primary); }
.bg-secondary { background-color: var(--secondary); }
.bg-success { background-color: var(--success); }
.bg-danger { background-color: var(--danger); }
.bg-warning { background-color: var(--warning); }
.bg-info { background-color: var(--info); }
.bg-dark { background-color: var(--dark); }
.bg-light { background-color: var(--light); }


/* buttons */
.btn{
    cursor: pointer;
    display: inline-block;
    padding: 10px 30px;
    border: none;
    border-radius: 5px;
}

.btn:hover{
    opacity: .9;
}

.btn-primary {
    color: #fff;
    background-color: var(--primary);
}
.btn-secondary {
    color: #fff;
    background-color: var(--secondary);
}
.btn-success {
    color: #fff;
    background-color: var(--success);
}
.btn-danger {
    color: #fff;
    background-color: var(--danger);
}
.btn-warning {
    color: #fff;
    background-color: var(--warning);
}
.btn-info {
    color: #fff;
    background-color: var(--info);
}
.btn-dark {
    color: #fff;
    background-color: var(--dark);
}
.btn-light {
    color: #333;
    background-color: var(--light);
}

.btn-outline-primary{
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}
.btn-outline-primary:hover{
    background-color: var(--primary);
    border: 1px solid var(--primary);
    color: var(--white);
}

.btn-outline-light{
    background: transparent;
    border: 1px solid var(--light);
    color: var(--light);
}
.btn-outline-light:hover{
    background-color: var(--light);
    border: 1px solid var(--light);
    color: var(--primary);
}

/* flex items */
.flex-items{
    display: flex;
    justify-content: center;
    text-align: center;
    height: 100%;
}

.flex-items > div{
    padding: 20px;
    flex-basis: 100%;
}

/* flex columns */
.flex-columns.flex-reverse .row{
    flex-direction: row-reverse;
}

.flex-columns .row{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    width: 100%;
}

.flex-columns .column{
    flex: 1;
}

.flex-columns.article .column:nth-child(odd){
    flex: 2;
}

.flex-columns.article .column:nth-child(even){
    flex: 3;
}

.flex-columns .column .column-1,
.flex-columns .column .column-2{
    height: 100%;
}

.flex-columns .column-2{
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 3rem;
}

.flex-columns img{
    width: 100%;
    height: 100%;
}

/* flex grid */
.flex-grid .row{
    display: flex;
    flex-wrap: wrap;
    padding: 0 .4rem;
}

.flex-grid .column{
    flex: 25%;
    padding: 0 .4rem;
}

/* section */
.section-header{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 3rem;
}

.section-header h2{
    font-size: 4rem;
    margin: 2rem 0;
}

.section-padding{
    padding: 2rem 2rem 4rem;
}

/* mobile */
@media (max-width: 768px){
   .flex-items{
    flex-direction: column;
   }

    .flex-items > div{
    padding: 10px;
    }

   .flex-columns .column{
    flex: 100% !important;
   }

   .flex-grid .column{
    flex: 50%;
   }
   
}

@media (max-width: 576px){
    .flex-grid .column{
        flex: 100%;
    }

    .flex-items > div{
        padding: 8px;
    }
}