body {
  font-family: 'Helvetica Neue', sans-serif;
  background-color: #f9f9f9;
  color: #333;
  padding: 40px;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  color: #222;
  font-size: 28px;
  margin-bottom: 20px;
}

/* ---- ここが原因！---- */
form {
  background-color: #fff;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
  max-width: 500px;
  width: 100%;
  margin-bottom: 30px;
}

/* ▼▼▼★この下を追加★▼▼▼ */
form[method="POST"].inline-form,
form.delete-inline,
.history-block form {
  background: none !important;
  box-shadow: none !important;
  border-radius: 0 !important;
  padding: 0 !important;
  max-width: none !important;
  width: auto !important;
  margin-bottom: 0 !important;
  display: inline !important;
}
/* ▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲ */

label {
  display: block;
  margin-bottom: 12px;
  font-weight: bold;
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea {
  width: 100%;
  padding: 10px;
  margin-top: 6px;
  margin-bottom: 15px;
  border-radius: 6px;
  border: 1px solid #ccc;
  box-sizing: border-box;
  font-size: 14px;
}

button,
input[type="submit"] {
  background-color: #007BFF;
  color: white;
  border: none;
  padding: 12px 18px;
  border-radius: 6px;
  cursor: pointer;
  margin-top: 10px;
  font-size: 15px;
}

button:hover,
input[type="submit"]:hover {
  background-color: #0056b3;
}

a {
  color: #007BFF;
  text-decoration: none;
  font-weight: bold;
}

a:hover {
  text-decoration: underline;
}

textarea {
  resize: vertical;
  min-height: 100px;
}
#keyword {
  font-size: 1.3em !important;
  height: 1.5em;
}

.delete-btn {
  background: #e74c3c;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 6px 18px;
  font-size: 1em;
  font-weight: bold;
  cursor: pointer;
  margin-left: 10px;
  margin-top: 4px;
  transition: background 0.2s;
  box-shadow: 0 1px 5px #0001;
}
.delete-btn:hover {
  background: #c0392b;
}