ul{display:grid; grid-template-columns:50px 1fr; list-style-type:none; align-items:center;}
li{background-size: auto 100%;}
li:nth-child(1) {background:url(img/1.png) left center no-repeat ; padding-left:50px;}
li:nth-child(2) {background:url(img/2.png) left center no-repeat ; padding-left:50px;}
li:nth-child(3) {background:url(img/3.png) left center no-repeat ; padding-left:50px;}
li:nth-child(4) {background:url(img/4.png) left center no-repeat ; padding-left:50px;}
li:nth-child(5) {background:url(img/5.png) left center no-repeat ; padding-left:50px;}
li:nth-child(6) {background:url(img/6.png) left center no-repeat ; padding-left:50px;}<form class="mainform">
<input placeholder="Имя*">
<input placeholder="Email*">
<br class="clear"/>
<textarea placeholder="Ваше сообщение*"></textarea>
</form>*{box-sizing:border-box;}
.mainform input{width:49%; float:left; margin:1%; padding:5px 10px;}
.mainform textarea{width:100%; padding:5px 10px; margin:1%;}
}