.btn {
    display: inline-block;
    font-weight: 400;
    color: #757575;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  }
  
  @media (prefers-reduced-motion: reduce) {
    .btn {
      transition: none;
    }
  }
  
  .btn:hover {
    color: #757575;
    text-decoration: none;
  }
  
  .btn:focus, .btn.focus {
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(255, 72, 0, 0.25);
  }
  
  .btn.disabled, .btn:disabled {
    opacity: 0.65;
  }
  
  .btn:not(:disabled):not(.disabled) {
    cursor: pointer;
  }
  
  a.btn.disabled,
  fieldset:disabled a.btn {
    pointer-events: none;
  }
  
  .btn-primary {
    color: #fff;
    background-color:  #298bcc;
  /*  border-color: black*/
  }
  
  .btn-primary:hover {
    color: #fff;
    background-color: rgb(5, 5, 83);
    border-color: black;


  }
 
  
  
  .btn-lg, .btn-group-lg > .btn {
    padding: 0.5rem 1rem;
    font-size: 1.25rem;
    line-height: 1.5;
    border-radius: 0;
  }
  
  .btn-sm, .btn-group-sm > .btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    line-height: 1.5;
    border-radius: 0;
  }
  
  .btn-block {
    display: block;
    width: 100%;
  }
  
  
.try{
  background-color: yellow !important;
}
  
  .back-to-top {
    position: fixed;
    display: none;
    right: 30px;
    bottom: 30px;
    z-index: 11;
    animation: action 1s infinite alternate;
  }
  
  @keyframes action {
    0% {
      transform: translateY(0);
    }
    100% {
      transform: translateY(-15px);
    }
  }
  
 
 
  @keyframes pulse-border {
    0% {
      transform: translateX(-50%) translateY(-50%) translateZ(0) scale(1);
      opacity: 1;
    }
    100% {
      transform: translateX(-50%) translateY(-50%) translateZ(0) scale(1.5);
      opacity: 0;
    }
  }