<div class="bg">
<button class="btn"><img src="img/icon.svg"><span>текст</span></button>
</div>

.bg{
  background: black;
}
.btn {
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    background: none;
    margin: 15.25px 15.49px 15.25px 12px;
    padding: 15.5px 17.25px;
    font-size: 0;
}

.btn>span{
    font-size: 14px;
    color: #fff;
    padding-left:8.5px ;
}