* {
  box-sizing: border-box;
}

body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  background-color: rgb(234, 236, 234);
  
}
.header {
  max-width: 50%;
  margin: auto;
}

.header img {
  max-width: 50%;
  overflow: hidden;
  height: 80px;
  float: left;
  display: block;
  margin: auto;
  
}
.fechac{
  font-size: 14px;
  border-radius: 10px;
  color: #000;
}
.fechar{
  text-align: left;
}

p {
  color:#0000FF;
  text-align: center;
  font-size: 18px solid;
}

div form {
  max-width: 50%;
  min-width: 600px;
  overflow: auto;
  margin: auto;
  border-radius: 10px;
  box-shadow: 5px 10px 8px #888888;
  background-color: #e3cbe4a6;
  padding: 20px;
  clear: both;
}

fieldset {
  margin-bottom: px;
  border-radius: 20px;
}

label {
  font-weight: bolder;
  font-size: 16px;
}

input:not([type="radio"]),
select,
textarea {
  width: 100%;
  padding: 10px 15px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  border-color: rgb(86, 88, 84);
}
input[name*="material"] {
  width: 75%;
  padding: 10px 12px;
  border-color: rgb(86, 88, 84);
}
input[name*="cantidad"] {
  width: 20%;
  padding: 10px 12px;
  margin-left: 20px;
  border-color: rgb(86, 88, 84);
}

input[type="submit"],
input[type="reset"] {
  width: 20%;
  padding: 12px 15px;
  border-color: rgb(86, 88, 84);
  border-radius: 40px;
  background-color: #8dbbda;
}

.btnVolver {
width: 20%;
  padding: 12px 15px;
  border-color: rgb(86, 88, 84);
  border-radius: 40px;
  background-color: gray;
}

input[type="submit"]:hover,
input[type="reset"]:hover {
  background-color: #308fce;
}

@media only screen and (max-width: 600px) {
  div form {
    width: 30%;
    min-width: 450px;
    overflow: auto;
  }

  input[name*="material"] {
    width: 68%;
  }
  input[name*="cantidad"] {
    width: 25%;
  }

  .header {
    max-width: 100%;
    margin: auto 30px;
  }
  p {
    text-align: center;
  }
}