.border-none{
  border: none;
}

/* display */

.d-block{
  display: block;
}

.d-inline-block{
  display: inline-block;
}

.d-flex{
  display: flex;
  flex-wrap: wrap;
}

.jcc{
  justify-content: center;
}

.aic{
  align-items: center;
}

/* basic element */

img{
  max-width: 100%;
}

a:hover,a:focus{
  color: inherit;
}


/* spacing */
.mb-1{margin-bottom: 0.5rem;}
.mb-2{margin-bottom: 1rem;}
.mb-3{margin-bottom: 1.5rem;}
.mb-4{margin-bottom: 2rem;}
.mb-5{margin-bottom: 3rem;}

.mt-1{margin-top: 0.5rem;}
.mt-2{margin-top: 1rem;}
.mt-3{margin-top: 1.5rem;}
.mt-4{margin-top: 2rem;}
.mt-5{margin-top: 3rem;}

.mr-1{margin-right: 0.5rem;}
.mr-2{margin-right: 1rem;}
.mr-3{margin-right: 1.5rem;}
.mr-4{margin-right: 2rem;}
.mr-5{margin-right: 3rem;}

.ml-1{margin-left: 0.5rem;}
.ml-2{margin-left: 1rem;}
.ml-3{margin-left: 1.5rem;}
.ml-4{margin-left: 2rem;}
.ml-5{margin-left: 3rem;}