.signature-logo{
  width:145px;
  height:35px;
  overflow:hidden;
  position:relative;
  flex:0 0 auto;
}

.signature-logo img{
  position:absolute;
  top:0;
  left:0;
  width:145px;
  height:auto;
  max-width:none;
  display:block;
}

@media(max-width:520px){
  .signature-logo{width:125px;height:30px}
  .signature-logo img{width:125px}
}