.iconGrid {
    margin-top: 40px;
    position:	relative;
}

.iconItem {
    float: left;
    width: 24%;
    margin-right: 1%;
    margin-bottom: 4px;
    position:	relative;
}
.iconItem img {
    width: 100%;
}

.iconItem p {
    position: absolute;
    bottom: 0;
    right: 0;
    margin: 0; /*余計な隙間を除く*/
    color: white;/*文字を白に*/
    background: #444eeb;/*背景色*/
    font-size: 1.5vw;
    line-height: 1;/*行高は1に*/
    padding: 5px 10px;/*文字周りの余白*/
}