body {  
  background-image: url("../imagens/fotos/rtv2.jpg");  
  background-position: left;
  background-attachment: initial;
  background-repeat: no-repeat;
  background-size: cover;  
  display: grid;
  align-items: left;
  justify-content: left;
  height: 90vh;
  font-family: Arial, Helvetica, sans-serif;
}

.mainbox {
  display: block;
  margin-left: 15%;
  height: 420px;
  padding: 5px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  /* background: #fff; */
  margin-top: 40px;
  width: 400px;
  /* opacity: 0.9; */
  /* float: right; */
}
.mainbox:before {
  content: "";
  position: absolute;
  background: inherit;
  z-index: -1;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  /* box-shadow: inset 0 0 2000px rgba(255, 255, 255, 0.5); */
  filter: blur(10px);
  margin: -20px;
}

.margin-top-pq {
  margin-top: 10px;
}

.margin-top-md {
  margin-top: 20px;
}

.margin-bottom-md {
  margin-bottom: 15px;
}

.padding-top-md {
  padding-top: 20px;
}

.margin-left {
  margin-left: 60px;
}

.margin-left-pq {
  margin-left: 20px;
}

.panel-heading {
  background-color: rgb(21, 5, 252, 0.2);
  color: #fff;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  font-size: 25px;
  text-align: center;
}

.btn {
  margin: 0px 20px;
}