.card{margin:0 auto;max-width:600px}.card-body{height:300px;overflow-y:auto;padding:10px}.message{border-radius:5px;margin-bottom:10px;padding:8px}.sent{background-color:#3498db;color:#fff}.received{background-color:#ecf0f1;color:#333}.card-footer{padding:10px}.input-group{width:100%}.btn-primary,.form-control{border-radius:0}
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