css - Align an image in the middle -


im trying align image in middle of page, failing that. currently, it's positioned on left side of container. react's render code:

return (             <div>                 <div classname="container">                     <div id="logo">                         <img src={require('../../images/vidn_logo.png')} />                     </div>                     {heading}                     <form classname="form-signin" onsubmit={this.formsubmit}>                         <input onchange={this.setemail} type="email" classname="form-control"                                autocomplete="email" placeholder="email" required></input>                         <input onchange={this.setpass} type="password" classname="form-control"                                autocomplete="new-password" placeholder="password" required></input>                         <button classname="btn btn-lg btn-primary btn-block"                                 type="submit" style={{margintop: '20px'}}>log in</button>                     </form>                 </div>                 <footer />             </div>         )

css:

.container {         width: auto;         padding: 60px 0 100px;     } #logo {         margin-bottom: 50px;         height: 30px;     }

what should add/edit in order img in middle?

try doing 

<div classname="logo-wrapper"><div id="logo>...</div></div>  .container {    width: 100%; }  .logo-wrapper {     display: flex;     justify-content: center;     width: 100%; }

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