@media only screen and (max-width : 720px),
only screen and (max-device-width : 720px){
.del { display: none; }
.del:not(:checked) + label + * { display: none; }
 }

.del:not(:checked) + label,
.del:checked + label {
display: inline-block;
padding: 2px 20px;
border-radius: 2px;
color: #fff;
background: #4e6473;
cursor: pointer;
letter-spacing: 7px;
}
.del:checked + label {
background: #e36443;
}