.app-black-triangle-left-arrow {
    border: 0; 
    border-top: solid 3px #000000; 
    border-left: solid 3px #000000;
    display: inline-block; 
    transform: rotate(-45deg); 
    width: 10px; 
    height: 10px;
} 

.phone-black-triangle-left-arrow {
    border: 0; 
    border-top: solid 3px #000000; 
    border-left: solid 3px #000000;
    display: inline-block; 
    transform: rotate(-45deg); 
    width: 10px; 
    height: 10px;
} 

.pc-black-triangle-left-arrow {
    border: 0; 
    border-top: solid 3px #000000; 
    border-left: solid 3px #000000;
    display: inline-block; 
    transform: rotate(-45deg); 
    width: 10px; 
    height: 10px;
}